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23 Ιαν 2024 · With the PTT test, the reference range is between 25 and 33 seconds. As with the PT test, a higher PTT number means your blood is taking longer than usual to clot. A lower PTT number means that your blood is clotting faster than normal.
8 Ιουν 2024 · Normal PT values range from 9 to 13 seconds. Higher PT values indicate a prolonged clotting time, suggesting potential issues with clotting factors such as fibrinogen, factor V, VII, X, and prothrombin.
29 Απρ 2024 · The normal ranges for PT/INR results are: 11 to 13.5 seconds. INR of 0.8 to 1.1. INR of 2.0 to 3.0 if you’re taking warfarin. (There are some conditions for which a higher or lower target PT range is desired.) Abnormal PT results. A high PT test result or INR level means it takes more time than usual for your blood to clot.
31 Ιαν 2022 · A patient has an unexpectedly prolonged aPTT of > 150 seconds and a normal PT. The patient is not receiving any anticoagulants and has no history of bleeding or thrombosis. The laboratory investigates this unexpected value and identifies a prolonged thrombin time of > 150 seconds.
The normal range for the activated partial thromboplastin time (aPTT) blood test is 25 to 35 seconds. A prolonged activated partial thromboplastin time (aPTT) indicates that it is taking longer for the blood to clot than normal. This can be caused by a variety of factors, including:
Laboratory data show a normal complete blood cell count and PT and an APTT of 60 seconds (reference range, 23-33 seconds). A mixing study with normal plasma corrects the APTT, and additional factor assays demonstrate normal factors VIII, IX, and XI but a low factor XII (2%; reference range, 60%-160%).
Activated partial thromboplastin time (APTT) is typically analyzed by a medical technologist or laboratory technician, either manually or using an automated instrument at 37°C, which approximates normal human body temperature.
