What's this test for?

This test is ideal if you're experiencing unusual bruising, prolonged bleeding from cuts, heavy nosebleeds, or heavy menstrual periods. It's also commonly used if you're being monitored on blood-thinning medication or preparing for a surgery that requires a clotting check. The test helps figure out if your blood is taking too long to clot properly.

What happens after I get my results?

Your results will show up in your account with the normal clotting time range clearly explained next to your value. If your result falls outside the normal range, simple next steps like retesting, adjusting medications, or seeking care quickly are outlined based on how far off the value is. You can download a standard lab report from your account at any time, and if you test again in the future, the trends feature lets you compare results side by side.

What's included in this test?

This test measures the activated Partial Thromboplastin Time (aPTT), screening for deficiencies or inhibitors in intrinsic pathway clotting factors (Factors VIII, IX, XI, and XII) and common pathway clotting factors (Factors II, V, X, and fibrinogen). Checking how long it takes blood to clot through these pathways helps catch a wide range of bleeding-related issues in a single blood draw, whether from an inherited condition, medication effect, or an underlying health issue.

How can I naturally support healthy blood clotting?

Eating foods rich in vitamin K, like leafy greens, helps your body produce clotting factors naturally. Staying hydrated and limiting excessive alcohol intake also supports normal blood function. If you take fish oil, garlic supplements, or high-dose vitamin E, be aware these can thin your blood, so it's worth noting them when you test.

When will I get my results?

Results are typically ready within about 7 days of your blood draw. You'll get a notification once your report is available in your account. If your results show a value that needs urgent attention, follow the guidance provided with your report right away.

Who should consider this test?

This test is a good fit if you have a personal or family history of bleeding disorders, notice frequent unexplained bruising, or are on blood-thinning medication that needs monitoring. It's also useful before certain surgical procedures where clotting ability matters. People with liver conditions that can affect clotting factors may also want to check this.

What symptoms indicate I may need this test?

Watch for signs like bruising easily without a clear cause, nosebleeds that are hard to stop, bleeding gums, blood in urine or stool, or unusually heavy periods. Prolonged bleeding after minor cuts or dental work is another common sign. If you notice several of these together, it's worth getting checked.

What does a high result mean?

A high (prolonged) result means your blood is taking longer than normal to clot, which can raise your risk of excessive bleeding. This can happen due to certain medications, a clotting factor deficiency, or liver issues. If your value is significantly elevated, avoid activities with injury risk and seek medical care if you notice active or unusual bleeding.

What causes an abnormal clotting time?

Abnormal results can come from blood-thinning medications, certain inherited clotting factor deficiencies, liver disease, or vitamin K deficiency. Some autoimmune conditions can also interfere with clotting factors. Retesting after ruling out recent medication use can help clarify what's driving the result.

How often should I retest?

If you're on blood-thinning medication or have a known clotting condition, periodic retesting as advised by your treatment plan is a good idea. Otherwise, if your first result is normal and you have no ongoing symptoms, you likely don't need to retest unless new symptoms appear. Anyone preparing for surgery should retest close to the procedure date if instructed.

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.

aPTT Blood Clotting Test - Bleeding Risk Check

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]

Blood Clotting Time Test (aPTT)

Partial Thromboplastin Time, Activated

Prescription & fees included

Easy to understand results

Fast & convenient

Prescription & fees included

Easy to understand results

Fast & convenient

What's this test for?

What's included in this test?

What happens after I get my results?

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

Find a lab near you

Blood Clotting Time Test (aPTT)

Prescription & fees included

Easy to understand results

Fast & convenient

1,000,000+ blood tests later, here's what our customers say