What's this test for?

This test is ideal if you're experiencing unusual bruising, prolonged bleeding after cuts or surgery, or if bleeding disorders run in your family. It's also useful if you're already on Factor VIII replacement therapy and need to check how well it's working, or if you want to know whether you carry a gene linked to hemophilia A. Many people use this test to get clear answers about their blood's clotting ability.

What's included in this test?

This test measures the amount of Factor VIII protein in your blood, which is a key clotting factor. Checking the antigen level (rather than just how well it functions) helps distinguish between different causes of low clotting activity and can identify carrier status for hemophilia A. It's often paired with functional clotting assays for a fuller picture of your clotting health.

What happens after I get my results?

Your results will show up in your account with the normal range clearly explained next to your value, so you can see exactly where you stand. If your level is outside the expected range, the report will explain what that means and whether retesting or further follow-up makes sense; if a result looks dangerously low and you have active bleeding symptoms, seek medical care right away. A standard lab report is always available to download from your account. You can also use the trends feature to track this marker over time, which is especially helpful if you're monitoring replacement therapy or carrier status.

How can I naturally support healthy blood clotting?

Eating foods rich in vitamin K, like leafy greens, supports your body's natural clotting process. Staying well hydrated and avoiding excessive alcohol can also help maintain healthy blood function. That said, if you have a diagnosed clotting factor deficiency, lifestyle steps are supportive only and won't replace the specific treatment your condition needs.

When will I get my results?

Results are typically ready within about 7 days of your lab visit. Once processed, they'll automatically appear in your online account, and you'll be notified when they're ready to view. You can download the full report at that time.

Who should consider this test?

This test is a good fit for people with a personal or family history of hemophilia A, those experiencing unexplained bruising or prolonged bleeding, and women who may be carriers of the hemophilia gene. It's also useful for people currently receiving Factor VIII replacement therapy who want to monitor their treatment.

What symptoms indicate I may need this test?

Frequent or unusual bruising, bleeding that takes a long time to stop, heavy or prolonged menstrual periods, or bleeding into joints and muscles can all be signs worth checking. A family history of hemophilia is another strong reason to test, even without symptoms. Excessive bleeding after dental work or minor surgery is another common trigger for this test.

What is Factor VIII and why does it matter?

Factor VIII is a protein in your blood that plays a critical role in helping blood clot properly. When you're low on it, even small cuts or injuries can lead to prolonged or excessive bleeding, and internal bleeding into joints can cause long-term damage. Knowing your Factor VIII level helps explain unexplained bleeding symptoms and guides treatment decisions.

What does a low Factor VIII antigen result mean?

A low result suggests your body isn't producing enough of this clotting protein, which is the hallmark of hemophilia A or can indicate carrier status in women. The severity of symptoms usually relates to how low the level is. This finding is often used alongside functional clotting tests to confirm a diagnosis and guide next steps.

How often should I retest?

If you're on Factor VIII replacement therapy, periodic retesting helps confirm the treatment is maintaining adequate levels, often every few months or as recommended by your treatment plan. If you're being monitored for carrier status or a family history of hemophilia, a one-time test may be enough unless new symptoms develop. Anyone with ongoing bleeding symptoms should retest whenever those symptoms change or worsen.

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.

Factor VIII Antigen Test - Hemophilia A Screening

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

[email protected]

Factor VIII Antigen Blood Test — Bleeding Disorder Check