What's this test for?

This test is ideal if you're on blood thinners like warfarin or heparin and need to monitor how well they're working. It also helps if you've experienced unexplained bruising, prolonged bleeding, or have a family history of bleeding disorders. Many people use this test to ensure their blood is clotting properly before surgery or to diagnose potential clotting issues.

What happens after I get my results?

You'll receive detailed doctor notes in simple language explaining what your clotting times mean and how they relate to your risk of bleeding or thrombosis. These notes include personalized recommendations like whether your blood thinner dosage may need adjustment, lifestyle precautions to take, or when to follow up with your doctor. You'll also get the standard lab report and can track your PT/INR and PTT levels over time using our trends feature, which is especially helpful if you're on medication management.

What's included in this test?

This panel measures INR (International Normalized Ratio), Partial Thromboplastin Time (Activated), and PT (Prothrombin Time). This test evaluates two key aspects of your blood's clotting ability. PT (Prothrombin Time) and INR measure how long it takes your blood to clot through the extrinsic pathway, which is crucial for monitoring warfarin therapy and detecting clotting factor deficiencies. PTT (Partial Thromboplastin Time) assesses the intrinsic clotting pathway and is used to monitor heparin therapy and diagnose inherited bleeding disorders. Together, these measurements provide a complete picture of your coagulation system and help ensure your blood thinner medication is working safely and effectively.

How should I prepare for this test?

No fasting is needed for this test, making it convenient to schedule at any time of day. You can eat and drink normally before your blood draw. However, if you're taking blood thinners, continue taking them as prescribed unless your doctor specifically instructs otherwise, since the test is designed to measure how the medication is affecting your clotting time.

Who should consider getting this test?

This test is essential for anyone taking blood thinners like warfarin or heparin to prevent strokes or blood clots. It's also important for people with unexplained bruising or bleeding, those preparing for surgery, individuals with a family history of bleeding disorders like hemophilia, and anyone whose doctor suspects a clotting abnormality. Regular monitoring helps ensure your blood is clotting safely within the right range.

What symptoms indicate I may need this test?

You may need this test if you experience frequent nosebleeds, bruising easily without injury, bleeding gums, unusually heavy menstrual periods, or prolonged bleeding from minor cuts. Other signs include blood in urine or stool, or if you're experiencing unexplained fatigue that could indicate internal bleeding. Anyone on blood thinners should have regular testing regardless of symptoms.

What does a high INR mean?

A high INR means your blood is taking longer than ideal to clot, which increases your risk of bleeding. This often happens when your warfarin dose is too high or when you've had changes in diet, medications, or health conditions. While a slightly elevated INR may just require a dosage adjustment, significantly high values need immediate medical attention to prevent serious bleeding complications.

What does a prolonged PTT mean?

A prolonged PTT means your blood is taking longer to clot through the intrinsic pathway, which could indicate your heparin dose is too high, you have a clotting factor deficiency, or you have a bleeding disorder. It might also be affected by certain medications or liver disease. Your doctor will review your results in context with your medications and health history to determine if any adjustments are needed.

How often should I retest my PT/INR and PTT?

If you're taking warfarin, you'll typically need INR testing every 2-4 weeks once stable, or more frequently when starting the medication or adjusting doses. For heparin monitoring, PTT is often checked every 4-6 hours initially until stabilized. If you're testing for diagnosis without medication, your doctor will determine follow-up timing based on your specific situation and initial results.

What should I do if my clotting time is abnormal?

If your results are outside the target range, contact your doctor promptly, especially if you're on blood thinners. They may adjust your medication dosage, recommend dietary changes, or order additional tests to identify the cause. Avoid starting new medications or supplements without consulting your doctor, as many can affect clotting times. Continue monitoring as recommended to ensure your levels return to the safe range.

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.

Blood Clotting Test - PT/INR & PTT for Blood Thinners

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 Test for Bleeding or Blood Thinner Monitoring

Prothrombin Time (PT) (INR) and Partial Thromboplastin Time (PTT)

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

What's this test for?

How should I prepare for this test?

What's included in this test?

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

Blood Clotting Test for Bleeding or Blood Thinner Monitoring

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

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