What are normal results for a partial thromboplastin time test?

Normal partial thromboplastin time (PTT) results usually fall within a range of 25 to 35 seconds. However, the reference range may vary slightly between different laboratories and testing methods. It's important to consult the specific reference range provided by the laboratory that performed the test for the most accurate interpretation of your results.

The PTT test is used to measure the time it takes for a blood clot to form when specific clotting factors and chemicals are added to a blood sample. It is commonly used to assess the function of various clotting factors, such as factors II, V, VII, VIII, IX, X, XI, and XII, as well as the overall integrity of the intrinsic and common coagulation pathways.

If your PTT result falls outside the normal reference range, it could indicate an underlying medical condition or issue that affects blood clotting. In such cases, further investigation and additional testing may be necessary to determine the cause and receive appropriate medical management.