Quick Answer: What Are Normal Ptt Levels?

Measured in seconds to clot formation, normal PTT can vary based on laboratory or institution; however, normal PTT is between 25 to 35. PTT ranges are used to classify heparin dosing schemes as low or high intensity and to ensure effective dosing.

What PTT level is considered high?

A typical aPTT value is 30 to 40 seconds. If you get the test because you’re taking heparin, you’d want your PTT results to be more like 120 to 140 seconds, and your aPTT to be 60 to 80 seconds. If your number is higher than normal, it could mean several things, from a bleeding disorder to liver disease.

What should my PTT be?

Normal PTT test results Normal results are typically 25 to 35 seconds. This means that it took your blood sample 25 to 35 seconds to clot after adding the chemicals. The exact standards for normal results may vary depending on your doctor and lab, so ask your doctor if you have any concerns.

What do PTT levels indicate?

Your PTT test results will show how much time it took for your blood to clot. Results are usually given as a number of seconds. If your results show that your blood took a longer-than-normal time to clot, it may mean you have: A bleeding disorder, such as hemophilia or von Willebrand disease.

What is the normal PTT for heparin?

While protocols vary from institution to institution, the therapeutic PTT range for heparin is 60 to 100 seconds, with lower intensity dosing in the range of 60 to 80 seconds.

What is normal protime and INR?

Prothrombin time test results are given in a measurement called an INR (international normalized ratio). The normal range for clotting is: 11 to 13.5 seconds. INR of 0.8 to 1.1.

What should your INR level be?

In healthy people an INR of 1.1 or below is considered normal. An INR range of 2.0 to 3.0 is generally an effective therapeutic range for people taking warfarin for disorders such as atrial fibrillation or a blood clot in the leg or lung.

What is normal range of APTT?

A normal range is around 21 to 35 seconds. But test results will vary depending on equipment and methods used. So standard normal results will differ in each lab. If your aPTT takes longer than normal, it may mean several things.

Does aspirin affect PTT?

No special preparations are needed for this test. If your child takes blood-thinning medication, antihistamines, or aspirin, you should tell the doctor because these can affect test results.

Is PTT for heparin or coumadin?

PTT is still being used to monitor standard heparin therapy. Warfarin (Coumadin ^®) anticoagulation therapy—the PTT is not used to monitor warfarin therapy, but PTT may be prolonged by warfarin at high dose. Typically, the prothrombin time/international normalized ratio (PT/INR) is used to monitor warfarin therapy.

What does a high PTT blood test mean?

An abnormal (too long) PTT result may also be due to: Bleeding disorders, a group of conditions in which there is a problem with the body’s blood clotting process. Disorder in which the proteins that control blood clotting become over active ( disseminated intravascular coagulation ) Liver disease.

What if PTT is low?

A longer-than-normal PTT or APTT can mean a lack of or low level of one of the blood clotting factors or another substance needed to clot blood. This can be caused by bleeding disorders, such as hemophilia or von Willebrand’s disease.

What medications affect PTT?

Answer

• Drugs that may prolong the test values, including antihistamines, ascorbic acid, chlorpromazine, heparin, and salicylates.
• Incorrect blood-to-citrate ratio.
• Hematocrit that is highly increased or decreased.
• Blood samples drawn from heparin lock or a heparinized catheter.

Does warfarin affect aPTT?

Results Warfarin markedly affected APTT; for each increase of 1.0 in the international normalized ratio, the APTT increased 16 seconds (95% confidence interval, 10-22 seconds). The effects of warfarin and heparin on APTT were additive.

Does heparin affect INR?

Anticoagulant or anti-thrombotic drugs such as Heparin and Low Molecular Weight Heparin will cause the INR to be higher because they are affecting the coagulation cascade directly.