cPass Neutralization Antibody Detection kit detects circulating neutralizing antibodies against SARS-CoV-2 that block the interaction between the receptor binding domain (RBD) of the viral spike glycoprotein with the ACE2 cell surface receptor. The cPass test is now authorized for semi-quantitative detection that provides a relative concentration result of an adaptive immune response to recent SARS-CoV-2 infection.
Watch the cPass video to learn how it works
A02087 SARS-CoV-2 Neutralizing Antibody Calibrator is now FDA authorized under Emergency Use Authorization with cPass SARS-CoV-2 Neutralization Antibody Detection Kit for semi-quantitative results. New
Notice! Customers should be aware that they may receive product with original packaging prior to the updated FDA EUA authorization November 12, 2021. Such packaging retains the original 6 month expiration, manufacturer address, and IFU for qualitative use. The current inventory is qualified for the expiration extension to 9 months. Should you have questions about your order's expiration, do not hesitate to contact us to provide updated information related to your order. All kit lots manufactured after February 1, 2022 will include the new authorized labeling.
See below additional details related to a list of kit lots with original packaging. An outline of label changes can be found in the Resources section.
Kit lots with packaging prior to November 12, 2021*:
Lot # | Original Expiration | Extended ExpirationNew |
---|---|---|
A210506 | November 16, 2022 | February 16, 2022 |
A210603 | December 2, 2022 | March 2, 2022 |
A210604 | December 6, 2022 | March 6, 2022 |
*Expiration extension applies to current GenScript inventory. If your order includes one of these kit lots, you will be informed that they include the original labels and they are eligible for the updated expiration per the updated FDA authorization dated November 12, 2021. The new expiration will be included on your quote and order.
Two clinical performance studies were conducted to validate the performance of the cPass SARS-CoV-2 Neutralization Antibody Detection Test using the Plaque Reduction Neutralization Test (PRNT) and SARS-CoV-2 virus WA01/2020 isolate. The cutoff for the PRNT comparator tests was established as indicated below:
PRNT50 Result Interpretation | |
---|---|
Positive: > 1:20 | Negative: < 1:20 |
PRNT90 Result Interpretation | |
Positive: > 1:10 | Negative: < 1:10 |
The first study evaluated the clinical agreement of 114 samples (n=114) from previously determined RT-PCR positive or negative patients. Samples were run in the cPass™ Test and PRNT as the comparator The Positive Percent Agreement (PPA) and Negative Percent Agreement (NPA) were calculated for each PRNT50 and PRNT90:
PRNT50 Clinical Agreement | |
---|---|
PPA: 100% | NPA: 100% |
PRNT90 Clinical Agreement | |
PPA: 100% | NPA: 100% |
The second study evaluated the clinical agreement of 140 samples (n=140) whereby the corhort consisted of 93 PRNT50 negative and 47 PRNT50 positive samples. The Positive Percent Agreement (PPA) and Negative Percent Agreement (NPA) were calculated:
PRNT50 Clinical Agreement | |
---|---|
PPA: 95.7% | NPA: 97.8% |
Additional semi-quantitative data analysis show concordance between the cPass SARS-CoV-2 Neutralization Antibody Detection Kit results and the titers obtained with the neutralization comparator method (PRNT50):
cPass Analyte Level Categories | cPass Titers Sub-Categories | PRNT50 Dilution Titers | |||
---|---|---|---|---|---|
Low Titer | High Titer | ||||
Target Not Detected <1:20 | 1:40-1:320 | 1:640-1: 5120 | |||
cPass SARS-CoV-2 Neutralization Antibody Detection Kit interval of numerical values in U/mL | Negative | Negative | 91 | 2 | 0 |
Low Titer | <100 U/mL | 2 | 22 | 1 | |
High Titer | >100 U/mL | 0 | 5 | 17 | |
Total | 93 | 29 | 18 | ||
Exact Agreement per Neutralization Titer Category | Equation | 22/29=75% | 17/18=94.4% | ||
Acceptance Criteria | 60% | 60% | |||
+/- Agreement per Neutralization Titer Category | Equation | 27/29=93% | 18/18=100% | ||
Acceptance Criteria | 80% | 80% | |||
95% Score CI | 78-98.1% | 82.4-100% | |||
Negative Percent Agreement (NPA) | Equation | 91/93=98% | |||
Acceptance Criteria | 95% | ||||
95% Score CI | 92.5-99.4% |
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Dr. Linfa Wang, Ph.D., FTSE, is the director of the Program in Emerging Infectious Diseases at Duke-NUS Medical School in Singapore. His team at Duke-NUS, worked together with Diagnostics Development Hub and GenScript co-developed cPass™ SARS-CoV-2 Neutralization Antibody Detection Kit.
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