Last Updated: July 2026
Estimated Reading Time: 24 minutes
Evidence Level: Regulatory Guidance, Compendial Standards, and Technical References
Reviewed Against: USP • ICH • FDA • Technical References
Identity testing is one of the most important analytical evaluations performed during laboratory characterization of research materials. Before questions about purity, net content, or other quality attributes can be meaningfully interpreted, laboratories must first establish that the analytical characteristics of a sample are consistent with the expected compound.
Unlike a single laboratory measurement, identity assessment is typically based on multiple complementary sources of analytical evidence. Chromatographic behavior, molecular-mass information, validated analytical methods, reference materials, and other supporting data may all contribute to the laboratory's overall interpretation.
This guide explains how laboratories use chromatographic behavior, molecular-mass information, reference materials, and validated analytical methods to support identity assessment—and why identity results must still be interpreted alongside purity, net content, and other laboratory findings.
At a Glance
| Topic | Details |
|---|---|
| Category | Quality Center |
| Reading Time | Approximately 24 minutes |
| Difficulty | Intermediate |
| Related Topics | Certificates of Analysis, HPLC, LC-MS, Reported Purity, Net Content |
| Last Updated | July 2026 |
What Is Identity Testing?
Identity testing is the analytical process of evaluating whether the observed characteristics of a sample are consistent with the expected compound. Rather than relying on a single measurement, laboratories may consider multiple complementary sources of evidence—including chromatographic behavior, molecular-mass information, reference materials, and validated analytical methods—to develop an identity assessment.[1][3][7]
The specific approach used depends on the analytical objective, the characteristics of the compound being evaluated, the instrumentation available, and the validated laboratory procedure. Some methods emphasize chromatographic comparison, while others incorporate mass spectrometry or additional analytical techniques to strengthen confidence in the result.[1][3][11][12]
It is important to distinguish identity from other analytical measurements commonly reported on a Certificate of Analysis.
Identity testing asks:
Are the observed analytical characteristics consistent with the expected compound?
This differs from other common laboratory evaluations:
- Reported Purity asks how much of the detectable chromatographic signal is attributed to the primary peak.
- Net Content evaluates how much peptide material is present in the container.
- Endotoxin Testing evaluates the presence of bacterial endotoxins.
- Sterility Testing evaluates whether viable microbial contamination is detected.
- Conformity Testing compares multiple samples from the same lot to assess batch consistency.
Each analytical test answers a different scientific question. Together, these results provide a more complete understanding of a research material than any individual laboratory measurement alone.
Quick Tip: Identity testing answers the question, "Is this material consistent with the expected compound?" It does not independently establish purity, quantity, sterility, potency, or overall quality.
Why Identity Matters
Identity testing provides the analytical foundation upon which many other laboratory results are interpreted. Before reported purity, net content, or other analytical measurements can be meaningfully evaluated, laboratories first seek evidence that the material being analyzed is consistent with the expected compound.[3][7][11][12]
For example, a Certificate of Analysis may report a chromatographic purity of 99.3%, but that value alone does not indicate whether the primary chromatographic peak corresponds to the intended compound. A high reported purity indicates that one integrated component accounts for most of the detectable chromatographic signal included in the calculation under the conditions of the analytical method. Establishing that this dominant component is consistent with the expected molecule requires additional analytical evidence.[1][3][7]
Identity testing therefore complements—not replaces—other analytical evaluations. Different laboratory tests answer different questions:
| Analytical Question | Typical Laboratory Evaluation |
|---|---|
| Is the material consistent with the expected compound? | Identity Testing |
| How much of the detectable chromatographic signal is attributed to the primary peak? | Reported Purity |
| How much peptide material is present? | Net Content |
| Are bacterial endotoxins present? | Endotoxin Testing |
| Is microbial contamination detected? | Sterility Testing |
| Are multiple vials from the same lot analytically consistent? | Conformity Testing |
Understanding which analytical question each test answers helps prevent common misunderstandings when interpreting laboratory documentation. No single laboratory result is intended to answer every question about a material. Instead, laboratories develop confidence by combining complementary analytical evidence generated using validated methods.[3][7][11][12]
Quick Tip: Identity testing establishes whether the analytical characteristics of a sample are consistent with the expected compound. Other laboratory tests evaluate different properties and should be interpreted alongside—not instead of—identity results.
How Laboratories Evaluate Identity
Identity testing is not typically based on a single laboratory measurement. Instead, laboratories evaluate multiple analytical characteristics to determine whether the observed results are consistent with the expected compound. The specific approach depends on the analytical objective, the compound being evaluated, the validated analytical method, and the instrumentation available.[1][3][7]
Depending on the analytical method, identity assessment may include evaluation of:
- Chromatographic retention behavior
- Molecular mass and mass-to-charge (m/z) information
- Isotope distribution patterns
- Fragmentation data obtained through tandem mass spectrometry (MS/MS), when applicable
- Comparison with qualified reference materials
- Method-specific acceptance criteria
- Additional complementary analytical techniques
Rather than relying on a single analytical result, laboratories evaluate whether multiple independent observations support the same conclusion. When chromatographic behavior, molecular-mass information, validated analytical methods, and reference comparisons all align with expectations, confidence in the identity assessment increases.[3][7][11][12]
This approach is sometimes described as using complementary or orthogonal analytical techniques. Instead of relying on one measurement alone, laboratories evaluate different characteristics of the sample using different scientific principles. Each technique contributes unique information, helping build a more complete understanding of the material.
Expected Compound
│
▼
Chromatographic Evidence (HPLC)
│
▼
Molecular-Mass Evidence (LC-MS)
│
▼
Reference Material Comparison
│
▼
Identity Assessment
No single analytical technique answers every question about a material. Instead, identity testing represents the laboratory's interpretation of the available analytical evidence within the capabilities and limitations of the validated method.
Quick Tip: Identity assessments become stronger when multiple complementary analytical techniques support the same conclusion rather than relying on a single laboratory result.
The Role of HPLC in Identity Testing
High-Performance Liquid Chromatography (HPLC) is one of the most widely used analytical techniques for supporting identity assessment. By separating detectable components within a sample, HPLC allows laboratories to compare the chromatographic behavior of an unknown material with the expected characteristics established by a validated analytical method.[1][3][7]
One of the primary observations made during HPLC analysis is retention time—the amount of time required for a compound to travel through the chromatographic system under defined analytical conditions. When analyzed using the same validated method, a sample that produces a retention time consistent with that of a qualified reference material may provide supporting evidence for identity.[1][3]
However, retention time alone does not independently establish molecular identity. Chromatographic behavior can be influenced by factors such as column chemistry, mobile-phase composition, temperature, flow rate, and other method parameters. In addition, different compounds may occasionally exhibit similar retention behavior under certain analytical conditions.[1][3][12]
For these reasons, laboratories typically interpret HPLC results within the context of the validated analytical method rather than relying on retention time as a standalone identifier. Additional analytical techniques, such as LC-MS, may be used to provide complementary molecular information that strengthens the overall identity assessment.
HPLC therefore contributes reproducible chromatographic evidence that laboratories can compare against validated analytical expectations during identity assessment. When combined with complementary analytical evidence, HPLC contributes to a more comprehensive evaluation of whether a sample exhibits the expected analytical profile.
Quick Tip: HPLC contributes valuable chromatographic evidence during identity testing, but retention time alone is generally not sufficient to establish molecular identity.
The Role of LC-MS in Identity Testing
Liquid Chromatography–Mass Spectrometry (LC-MS) complements chromatographic analysis by providing molecular-mass information that cannot be obtained through HPLC alone. After chromatographic separation, compounds enter the mass spectrometer, where they are ionized and measured according to their mass-to-charge ratio (m/z). This additional layer of analytical information helps laboratories evaluate whether the detected material exhibits the expected molecular characteristics.[8][9][10]
For peptide analysis, Electrospray Ionization (ESI) commonly produces multiple charged forms of the same molecule. Analytical software can use these related charge states to estimate the compound's neutral molecular mass, allowing laboratories to compare the observed result with the calculated or established molecular mass expected for the analyte.[8][9][10]
Agreement between the observed and expected molecular mass provides important supporting evidence for identity. However, molecular-mass agreement alone does not independently establish identity. Different compounds may share the same nominal mass, and closely related compounds may produce similar measured masses depending on the resolving power and mass accuracy of the instrument.[3][7][8][10]
When additional structural information is needed, laboratories may perform tandem mass spectrometry (MS/MS). In this technique, a selected ion is isolated and fragmented, producing a characteristic pattern of fragment ions. Evaluating these fragmentation patterns can provide additional structural evidence that supports identity assessment, particularly when distinguishing between closely related compounds.[9][10]
LC-MS provides molecular information that complements chromatographic evidence during identity assessment. When interpreted alongside HPLC, validated analytical methods, and appropriate reference materials, LC-MS strengthens the laboratory's overall confidence in the proposed identity assessment.
Quick Tip: LC-MS provides molecular-mass information that strengthens identity assessments, but it is most effective when interpreted alongside chromatographic evidence and other complementary analytical data.
Reference Standards and Complementary Analytical Techniques
Reference materials and complementary analytical techniques help laboratories build confidence when evaluating molecular identity. Rather than relying on a single analytical result, laboratories compare multiple independent observations to determine whether the overall body of evidence supports the identity assessment.[3][7][11][12]
A reference standard or qualified reference material is a material with documented analytical characteristics that has been established as suitable for a specific comparison within a defined laboratory method. Depending on the analytical procedure, laboratories may compare characteristics such as:
- Chromatographic retention time
- Chromatographic profile
- Molecular mass
- Isotope distribution
- Fragmentation patterns
- Other method-specific analytical characteristics
Agreement between a sample and an appropriate reference standard provides additional evidence supporting the identity assessment, but it does not eliminate the need for sound analytical judgment. The quality of the comparison depends on the suitability of the reference material, the validated analytical method, and the predefined acceptance criteria established by the laboratory.[3][7][12]
Laboratories may also use complementary, or orthogonal, analytical techniques. These methods evaluate different characteristics of the same sample using different scientific principles. Rather than duplicating information, each technique contributes unique evidence that helps support the laboratory's overall interpretation.
For example:
- HPLC evaluates chromatographic behavior, including retention characteristics and peak profiles.
- LC-MS provides molecular-mass information and, when applicable, fragmentation data.
- Reference-standard comparisons help determine whether observed analytical characteristics align with those of a material with established properties.
When these independent observations are consistent with one another, confidence in the identity assessment increases because multiple analytical approaches support the same conclusion. Conversely, if the results disagree, laboratories may perform additional investigation before reaching an analytical conclusion.
No single analytical technique is expected to answer every question about a sample. Instead, identity testing is strengthened by evaluating multiple complementary sources of analytical evidence within the capabilities and limitations of the validated laboratory method.
Quick Tip: The strongest identity assessments are typically supported by multiple complementary analytical techniques rather than a single laboratory measurement.
What Identity Testing Can Tell You
When interpreted within the context of validated analytical methods, Identity testing provides valuable analytical evidence that the observed analytical characteristics of a sample are consistent with the expected compound. Although identity testing does not answer every question about a material, it serves as a critical component of laboratory characterization and supports interpretation of other analytical results.[3][7][11][12]
Depending on the analytical methods used, identity testing may help laboratories:
- Determine whether chromatographic behavior is consistent with expectations
- Compare observed molecular-mass information with expected values
- Evaluate agreement with qualified reference materials
- Assess fragmentation patterns obtained through tandem mass spectrometry (MS/MS), when applicable
- Evaluate analytical consistency across repeated measurements
- Increase confidence when multiple complementary analytical techniques support the same conclusion
Identity testing also provides valuable context for interpreting Certificates of Analysis. When identity evidence supports the proposed molecular identity, researchers can more confidently interpret additional laboratory results such as reported purity, net content, endotoxin testing, and other analytical evaluations. Identity testing therefore serves as one component of a broader analytical assessment rather than an isolated laboratory result.[3][7][9][10]
It is important to recognize that identity testing is based on analytical evidence generated under defined laboratory conditions. The strength of an identity assessment depends on the validated analytical method, the quality of the supporting evidence, and the laboratory's established acceptance criteria.
Quick Tip: Identity testing provides evidence supporting the proposed molecular identity, but it should always be interpreted alongside complementary analytical results and validated laboratory methods.
What Identity Testing Cannot Tell You
Although identity testing is an essential part of laboratory characterization, it does not independently determine every property of a research material. Identity testing answers one specific analytical question and should not be interpreted as a complete assessment of sample quality.[3][7][11][12]
Identity testing does not independently establish:
- Chromatographic purity
- Net peptide content
- Biological potency or functional activity
- Sterility
- Endotoxin status
- Long-term stability
- Batch uniformity
- Manufacturing quality
- The absence of every potential contaminant
- Suitability for a specific research application
For example, a sample may produce analytical results consistent with the expected molecular identity while still requiring separate evaluation for purity, net content, endotoxins, sterility, or other analytical characteristics. Likewise, a material with high reported purity does not automatically establish molecular identity. Each laboratory test provides evidence about a different aspect of the material and should be interpreted within the context of the complete analytical record.[3][7][11][12]
Understanding these limitations is essential for responsible interpretation of Certificates of Analysis. Laboratories build confidence by evaluating multiple complementary sources of evidence rather than relying on any single analytical result.
Quick Tip: Identity testing answers the question, "Is this material analytically consistent with the expected compound?" It does not independently establish purity, quantity, biological activity, sterility, endotoxin status, or overall quality.
Why Identity Testing Should Never Be Viewed Alone
Identity testing is most valuable when interpreted as one component of a comprehensive analytical evaluation rather than as an isolated laboratory result. Laboratories routinely review identity evidence alongside chromatographic purity, net content, validated analytical methods, and other relevant laboratory data to develop a more complete understanding of a sample.[3][7][11][12]
For example, a researcher evaluating a Certificate of Analysis may consider several questions together:
- Are the analytical characteristics consistent with the expected compound?
- Does the chromatographic profile support the reported purity?
- Does molecular-mass information agree with expected molecular characteristics?
- Were appropriate reference materials or validated analytical methods used?
- Are additional laboratory results, such as endotoxin testing or conformity testing, available when applicable?
Considering these results together provides a stronger analytical foundation than relying on any individual measurement in isolation.
This principle extends throughout the First Due Biotech Quality Center. Identity testing, High-Performance Liquid Chromatography (HPLC), Liquid Chromatography–Mass Spectrometry (LC-MS), reported purity, and Certificates of Analysis each answer different analytical questions. When interpreted collectively, these complementary techniques provide a more complete understanding of research materials than any single laboratory result alone.[1][3][7][8][9][10]
Experienced laboratories therefore evaluate analytical evidence as a whole rather than relying on a single measurement, percentage, chromatographic peak, or mass spectrum. Confidence is built by assessing multiple independent observations within the capabilities and limitations of validated analytical methods.
Quick Tip: Identity testing is one part of a broader analytical evaluation. The strongest conclusions are supported by multiple complementary laboratory techniques interpreted together.
Key Takeaways
-
Identity testing evaluates whether the analytical characteristics of a sample are consistent with the expected compound.
-
Identity and purity answer different analytical questions and should not be interpreted as interchangeable results.
-
HPLC contributes chromatographic evidence, while LC-MS provides molecular-mass information that strengthens identity assessments.
-
Reference standards and complementary analytical techniques increase confidence when multiple independent observations support the same conclusion.
-
Identity testing does not independently establish purity, net content, potency, sterility, endotoxin status, stability, or overall quality.
-
The strongest identity assessments are based on multiple complementary sources of analytical evidence interpreted within validated laboratory methods.
Common Misconceptions
"High Purity Proves Identity"
No.
A dominant chromatographic peak indicates that one detectable component accounts for most of the chromatographic signal under the conditions of the analytical method. It does not independently establish that the component is the expected compound. Additional analytical evidence, such as LC-MS or reference-standard comparison, is often used to strengthen identity assessments.[1][3][7]
"A Matching Retention Time Proves Identity"
Not by itself.
Retention time provides valuable chromatographic evidence but is influenced by the analytical method and operating conditions. Different compounds may occasionally exhibit similar retention behavior, making additional analytical evidence important for identity assessment.[1][3][12]
"Matching Molecular Mass Proves Identity"
Not necessarily.
Agreement between observed and expected molecular mass provides important supporting evidence, but compounds with similar masses, structural modifications, or related species may require additional characterization through complementary analytical techniques.[8][9][10]
"LC-MS Identifies Every Compound in a Sample"
No.
LC-MS provides highly valuable molecular information, but analytical results remain dependent on the validated method, instrument performance, sample preparation, ionization efficiency, and data interpretation.[3][7][8][10]
"One Laboratory Test Answers Every Question"
No.
Identity testing answers one analytical question. Purity, net content, endotoxin testing, sterility testing, conformity testing, and other laboratory evaluations each provide different information that contributes to a broader analytical assessment.
Common Questions
What Is the Difference Between Identity Testing and Purity Testing?
Identity testing evaluates whether the observed analytical characteristics of a sample are consistent with the expected compound.
Purity testing evaluates how much of the detectable chromatographic signal is attributed to the primary peak under the conditions of the analytical method.
A sample can produce a high-purity chromatogram without independently establishing that the primary peak represents the expected compound. For that reason, identity and purity should be evaluated as separate analytical questions.[1][3][7]
Can HPLC Confirm Molecular Identity?
HPLC can provide supporting identity evidence through retention behavior, chromatographic profile, and comparison with an appropriate reference material.
However, retention time is method-dependent and can be influenced by column chemistry, mobile phase, temperature, flow rate, and other operating conditions. Different compounds may also exhibit similar retention behavior. HPLC is therefore generally interpreted alongside complementary analytical evidence rather than used as a standalone confirmation of molecular identity.[1][3][12]
Can LC-MS Confirm Molecular Identity?
LC-MS provides important molecular information that can strongly support an identity assessment. Laboratories may compare observed mass-to-charge ratios, estimated molecular mass, charge-state patterns, isotope distributions, and fragmentation data with expected values.[8][9][10]
The strength of the conclusion depends on the method, instrument performance, mass accuracy, resolving power, reference information, and available complementary evidence. LC-MS should therefore be described as supporting or strengthening identity rather than providing absolute certainty in every analytical situation.
What Does a Matching Molecular Mass Mean?
A matching molecular mass indicates that the observed result agrees with the expected molecular mass of the target compound.
This is important supporting evidence, but it does not always distinguish between compounds with similar or identical nominal masses. Structural modifications, adducts, truncations, degradation products, and closely related compounds may require additional chromatographic or fragmentation evidence for further characterization.[8][9][10]
What Is a Reference Standard?
A reference standard or qualified reference material is a material with documented analytical characteristics that has been established as suitable for comparison within a defined laboratory method.
Depending on the procedure, a laboratory may compare:
- Retention time
- Chromatographic profile
- Molecular mass
- Spectral characteristics
- Fragmentation patterns
- Other method-specific attributes
A useful reference standard must be appropriate for the analytical purpose and supported by suitable documentation. A product label alone does not automatically make a material a qualified analytical reference standard.[3][7][12]
What Are Orthogonal Analytical Techniques?
Orthogonal analytical techniques evaluate different characteristics of a sample using different scientific principles.
For example:
- HPLC evaluates chromatographic behavior.
- LC-MS provides molecular-mass information.
- MS/MS may provide fragmentation evidence.
- Reference-standard comparison evaluates agreement with a characterized material.
When independent techniques support the same conclusion, confidence in the identity assessment generally increases.
Why Might Two Laboratories Reach Different Identity Conclusions?
Laboratories may use different:
- Analytical methods
- Chromatography columns
- Mobile phases
- Mass spectrometers
- Reference materials
- Acceptance criteria
- Calibration procedures
- Data-processing settings
- Levels of mass accuracy or resolution
These differences can affect the analytical evidence available and how it is interpreted. A meaningful comparison requires understanding the methods and acceptance criteria used by each laboratory.[3][7][11][12]
Does Identity Testing Determine Net Content?
No.
Identity testing evaluates whether a sample is analytically consistent with the expected compound. Net content testing evaluates how much peptide material is present.
A sample may produce results consistent with the expected identity while containing more or less peptide material than the labeled amount. These measurements answer different questions and require different analytical procedures.
Does Identity Testing Measure Potency?
No.
Identity testing does not independently determine biological potency or functional activity. A compound may be analytically consistent with the expected molecule without establishing how it performs in a biological system.
Biological potency or functional activity requires an appropriate validated assay designed to evaluate that specific characteristic.
Why Doesn't One Laboratory Test Answer Every Question?
Each laboratory test is designed to evaluate a specific analytical characteristic of a sample. Because different tests are based on different scientific principles, they provide different types of information rather than duplicate one another.
For example:
- Identity Testing evaluates whether the analytical characteristics of a sample are consistent with the expected compound.
- Reported Purity estimates how much of the detectable chromatographic signal is attributed to the primary peak under the conditions of the analytical method.
- Net Content evaluates how much peptide material is present.
- Endotoxin Testing evaluates the presence of bacterial endotoxins.
- Sterility Testing evaluates whether microbial contamination is detected.
- Conformity Testing evaluates analytical consistency among multiple samples from the same production lot.
No single analytical technique is intended to answer all of these questions. Laboratories therefore interpret multiple complementary sources of evidence together to develop a more complete understanding of a material. This approach helps ensure that each analytical conclusion is supported by the methods most appropriate for the characteristic being evaluated.
Quick Tip: Different laboratory tests answer different scientific questions. The most meaningful interpretation comes from evaluating the complete analytical record rather than relying on any single laboratory result.
Does Every Certificate of Analysis Include Identity Testing?
Not necessarily.
The tests shown on a Certificate of Analysis depend on the laboratory, analytical scope, material, and services requested. Some reports may include purity and identity together, while others may report only selected analytical results.
Researchers should review the methods and results listed on the actual report rather than assuming that identity testing was performed.
Quick Tip: An identity conclusion is only as informative as the analytical methods and acceptance criteria behind it. Review the complete report to understand what evidence was actually generated.
Conclusion
Identity testing is a foundational part of laboratory characterization because it evaluates whether the observed analytical characteristics of a sample support the expected molecular identity. Unlike reported purity, net content, endotoxin testing, sterility testing, or conformity testing, identity assessment addresses a specific question: whether the available analytical evidence supports the expected molecular assignment.[1][3][7]
Laboratories may use chromatographic behavior, molecular-mass information, reference-standard comparison, isotope patterns, and fragmentation data to build an identity assessment. HPLC contributes retention and chromatographic evidence, while LC-MS adds molecular information that can strengthen the interpretation. When appropriate, tandem mass spectrometry and other complementary techniques may provide additional structural evidence.[8][9][10]
The most important principle is that identity is not established by one isolated number or graph. A matching retention time, dominant chromatographic peak, or expected molecular mass can each contribute useful evidence, but every result must be interpreted within the capabilities and limitations of the analytical method used.[3][7][11][12]
Understanding this distinction helps researchers review Certificates of Analysis more accurately. Identity testing provides one essential part of the analytical record, while purity, net content, endotoxin status, sterility, conformity, and other quality attributes require separate evaluation.
As part of its commitment to transparent scientific communication, First Due Biotech publishes educational documentation to help researchers understand how laboratory conclusions are developed, what supporting evidence may be used, and what each analytical result can reasonably demonstrate.
Related Resources
Explore additional educational resources in the First Due Biotech Quality Center:
- Understanding Certificates of Analysis (COAs)
- Understanding High-Performance Liquid Chromatography (HPLC)
- Understanding Liquid Chromatography–Mass Spectrometry (LC-MS)
- Understanding Reported Purity
- Understanding Net Content
- Understanding Endotoxin Testing
- Understanding Sterility Testing
- Understanding Independent Laboratory Testing
- Understanding Batch Testing
Scientific & Regulatory Sources
This article was researched and developed using authoritative regulatory guidance, compendial standards, peer-reviewed literature, and technical references addressing chromatography, mass spectrometry, analytical specificity, method validation, and molecular characterization.
Primary sources reviewed during development include:
- United States Pharmacopeia standards related to chromatography and analytical validation
- International Council for Harmonisation guidance on analytical procedure validation and development
- U.S. Food and Drug Administration guidance on analytical procedures and method validation
- Peer-reviewed literature describing LC-MS principles and applications
- Technical reference texts covering chromatography, mass spectrometry, molecular-mass interpretation, and fragmentation analysis
These sources were used to verify the article’s discussion of chromatographic retention, molecular-mass evidence, reference-standard comparison, method specificity, complementary analytical techniques, and the limitations of identity testing.
The complete bibliography and corresponding citation numbers are provided in the References section below.
Research Use Notice
The information provided in this article is intended solely for educational and informational purposes regarding laboratory documentation, analytical testing, and research materials.
It is not intended as medical advice, treatment guidance, dosing information, administration instructions, or recommendations for the use of any material.
Identity-testing results should be interpreted within the context of the analytical methods used, the laboratory’s acceptance criteria, the available supporting evidence, and any complementary testing performed.
First Due Biotech supplies materials for laboratory research purposes only. Products are Research Use Only (RUO) and not for human or veterinary use.