Frequently Asked Questions

SARS-CoV-2 Neutralizing Antibody Test

How do I sign up for a test?

To sign up for a SARS-CoV-2 Neutralizing Antibody Test, complete the online registration form here.

Are appointments required? How do I schedule an appointment?

Appointments are required. You can schedule an appointment during the online registration process. Click here to access the registration form.

What type of antibody test do you offer?

We perform the Neutralizing Antibody Test using the GenScript cPass™ SARS-CoV-2 Neutralization Antibody Detection Kit (FDA EUA). The test is designed to detect circulating neutralizing antibodies against SARS-CoV-2 that block the virus' ability to enter human cells and cause COVID-19 infection. The Neutralizing Antibody Test is different from the COVID-19 PCR test, which detects active SARS-CoV-2 infection. Learn more about the PCR Test that we offer. We do not offer the Rapid Test or the Antigen Test at this time. Molecular Matrix is providing COVID-19 testing under Emergency Use Authorization (EUA) from the FDA. All samples are tested in our CLIA-certified laboratory (CLIA ID: 05D2191785) in West Sacramento, CA.

How accurate is the test?

The GenScript cPass™ SARS-CoV-2 Neutralization Antibody Detection Kit has 93.80% sensitivity and 99.40% specificity.

What can I expect during the blood sample procedure?

You will be seated in our comfortable clinic lobby when you arrive for your appointment. Our clinical staff will explain the sample collection procedure to you and you will have the opportunity to ask questions. The phlebotomist will collect a small blood sample from your arm using a standard blood sample collection procedure. Your entire appointment will last approximately 10 minutes.

What kind of sample collection technique do you use?

Our clinical staff collect a small blood sample from the arm using a standard blood sample collection technique.

What are the potential benefits and risks of the test?

Potential benefits include:

  • The results, along with other information, can help your healthcare provider make informed recommendations about your care.
Potential risks include:
  • Possible discomfort or other complications that can happen during sample collection.
  • Possible incorrect test result (see below for more information).

When will I receive my test result?

Test results are available 3-4 days after your appointment. Results are typically sent during the evening. Results will be emailed to the email address provided during registration. Most tests are processed within the indicated turnaround timeframe unless the number of samples exceeds our laboratory capacity. We will notify you as soon as possible if we anticipate a delay in delivering your test result.

My entire family needs to get tested. How can we arrange that?

Each family member must complete a separate registration form and schedule an individual appointment time. It's okay if your appointments aren't in consecutive time slots, or back-to-back. On test day, the entire family can come to our clinic and get tested together.

Do you allow children to be tested?

We have a pediatric nurse on staff who performs all pediatric testing. Minors must be accompanied by a parent/legal guardian during the sample collection clinic visit.

How much does the test cost?

The SARS-CoV-2 Neutralizing Antibody Test costs $150.00 payable by credit or debit card only. The test is not covered by health insurance.

Do you accept health insurance? Will my health insurance cover the cost of the test?

Health insurance does not cover the SARS-CoV-2 Neutralizing Antibody Test. We do not accept any health insurance providers for this test service.

Do you accept debit cards, credit cards, or cash?

We accept all major credit cards and debit cards. We do not accept cash payments at this time.

Do I need a referral from my doctor?

No, you don't need a referral from your doctor. We have a physician on staff who reviews and approves test registrations.

What does it mean if I have a Positive test result?

A positive test result means there has been an adaptive immune response which may be an indicator of potential protection against the virus after infection or vaccination. At this time, it has not been shown scientifically that neutralizing antibody to SARS-CoV-2 indicates protection or immunity, however, neutralizing antibodies in other viral diseases have been shown to indicate protection.

If you have a positive test result, it is possible that you have or previously had COVID-19 and that you have developed an antibody response to the virus. Your healthcare provider will work with you to determine how best to care for you based on the test results along with other factors of your medical history, your symptoms, possible exposures, and geographic location of places you have recently traveled. There is also a chance that this test can give a positive result that is wrong (a false positive result). Even a high-performing antibody test when used in a population without many cases of COVID-19 infection may produce as many or more false results as true results because the likelihood of finding someone who has been infected is very small. Your healthcare provider will work with you to determine the likelihood of false result. This test may give you a neutralizing antibody result, but you should not interpret the result to mean that having any measurement of antibodies to SARS-CoV-2 will protect you from getting infected again or help reduce the severity or duration of a future COVID-19 infection. This topic is being studied, but the information is unknown. It is also not known how long antibodies to SARS-CoV-2 will remain present in the body after infection. Regardless of your test result, you should continue to follow CDC guidelines to reduce the risk of infection, including social distancing and wearing masks.

Who should get tested?

  • People who have received the COVID-19 vaccine (you can be tested after your first dose, after your second dose, or both)
  • People who have have not received a COVID-19 vaccine and are interested in their baseline neutralizing antibody activity
  • People who have been infected with COVID-19 in the past and have recovered more than two weeks ago

What does it mean if I have a Negative test result?

A negative test result means that neutralizing antibodies to the virus that causes COVID-19 were not found in your sample. However, it is possible for this test to give a negative result that is incorrect (false negative) in some people with COVID-19. Additionally, a negative result
may occur if you are tested early in your illness and your body hasn’t had time to produce antibodies to infection. This means that you could possibly still have COVID-19 even though the test is negative.
If this is the case, your healthcare provider will consider the test result together
with all other aspects of your medical history (such as symptoms, possible exposures, and geographical location of places you have recently traveled) in deciding how to care for you. It is important that you work with your healthcare provider to help you understand the next steps you should take.

I received the test result email but I can't open it. What should I do?

You will receive your digital result in a secure email. To open the email attachment, select "Read the Message" and choose to "Sign on with a one-time passcode." A passcode will be sent to your email address. Enter this passcode in the space provided on the browser window. We recommend accessing your test results on a computer. If you're still having trouble accessing your result, email us at or call us at 916-477-2027 (M-F, 9am-5pm).

I have more questions. Who can I contact?

Call us at 916-477-2027 or email us at Our offices are open from 9:00 AM to 5:00 PM, Monday through Friday.

Where are the hours and location for testing?

Hours: Monday through Thursday from 12:00 PM to 4:00 PM Contact us at if your preferred time slot is not available. Address: 3410 Industrial Blvd Suite 103, West Sacramento, CA 95691 Site Information: - Parking is available in front of the building. - Ring the doorbell to enter the clinic for your appointment.

What does it mean if I have an Invalid test result?

An invalid test result means there was an issue with your sample or with the test processsing. We recommend that you schedule another test so we can recollect your sample. When you come back for a re-collection, please inform the clinical staff that you are re-testing due to a previous invalid test result.

How can I cancel my appointment? Do you have a cancellation policy?

Appointment Cancellation We require that you notify us of a cancellation 24 hours in advance for a full refund. Appointments are in high demand, and your advanced notice will allow another patient access to that appointment time. Late Cancellations/No-Shows A cancellation is considered late when the appointment is cancelled less than 24 hours before the appointed time. A no-show is when a patient misses an appointment without cancelling. In either case, the patient will be refunded for the cost of the test minus a $100 missed appointment fee. How to Cancel Your Appointment Click the cancellation link in your confirmation email or email us at and leave a detailed message.

Do you accept samples from out of state?

We appreciate the opportunity to work with organizations outsite of the Sacramento, CA area. Our laboratory can receive frozen plasma samples for testing. Contact us to coordinate your testing needs.