What's this test for?

This test is ideal if you're immunocompromised, living with HIV, or on certain medications that weaken your immune system and you need to check for JC virus activity in your blood. JC virus can lead to a serious brain condition called PML, so catching it early matters. It's also useful if you've had unexplained neurological symptoms like vision changes, weakness, or confusion and your care team wants to rule out this cause.

What happens after I get my results?

Your results will show up in your account with the reportable range and your specific value explained in plain terms. If your result comes back detectable, next steps typically involve retesting to track the trend and taking a close look at any medications that suppress your immune system. You can download a standard lab report anytime from your account, and if you test again in the future, our trends feature lets you compare results side by side over time.

Who should consider this test?

People living with HIV, organ transplant recipients, and anyone taking immune-suppressing medications (like certain MS or autoimmune drugs) are the main groups who benefit from this test. It's also relevant if you've developed new neurological symptoms and want to check whether JC virus could be a factor. If you fall into a higher-risk category and haven't been tested before, this is a reasonable first step.

What symptoms indicate I may need this test?

Watch for new vision problems, weakness on one side of the body, trouble speaking, memory changes, or personality shifts, especially if you're immunocompromised. These symptoms can point to problems in the brain and shouldn't be ignored. If any of these come on quickly or get worse fast, seek medical care right away rather than waiting on test results.

When will I get my results?

Results are typically ready within about 7 days of your sample being collected. You'll get a notification once they're posted to your account, so there's no need to check repeatedly. The report explains what your number means and how it compares to the reportable range.

What is JC virus and why does it matter?

JC virus is a common virus that most people carry without ever having problems from it, because a healthy immune system keeps it inactive. But if your immune system is weakened, the virus can reactivate and attack the brain, causing a serious condition called PML. Testing for JC virus DNA helps catch reactivation early, before it causes lasting damage.

What does a high or detectable JC virus result mean?

A detectable or high result means JC virus DNA is actively present and replicating in your blood, which raises concern for possible PML, especially if you're immunocompromised. This doesn't automatically mean you have PML, but it's a signal that your immune status and any related medications should be reviewed closely. Follow-up testing and monitoring for neurological symptoms are typically the next steps.

What causes JC virus reactivation?

The biggest driver is a weakened immune system, whether from HIV, organ transplant anti-rejection drugs, chemotherapy, or certain long-term immune-modulating medications. Since most adults already carry a dormant form of the virus, reactivation happens when the immune system's ability to keep it in check drops. Managing the underlying cause of immune suppression, when possible, is key to lowering reactivation risk.

How often should I retest?

If you're on medications known to carry PML risk, periodic monitoring every few months is common practice, but the right interval depends on your specific risk factors and treatment. If a prior result was detectable, more frequent retesting helps track whether levels are rising or falling. Your trends dashboard makes it easy to see these changes at a glance over time.

What should I do if my results are abnormal?

If your result is detectable or unexpectedly high, it's important to act quickly rather than wait, given how serious PML can be if it progresses. Review any immune-suppressing medications you're taking and watch closely for new neurological symptoms like vision or coordination changes. If you notice any of those symptoms, seek medical care immediately rather than waiting for a scheduled follow-up.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

JC Virus DNA Test - PML Risk & Immune Monitoring

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

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