^

Health

A
A
A

Activated partial thromboplastin time (APTT)

 
, medical expert
Last reviewed: 23.04.2024
 
Fact-checked
х

All iLive content is medically reviewed or fact checked to ensure as much factual accuracy as possible.

We have strict sourcing guidelines and only link to reputable media sites, academic research institutions and, whenever possible, medically peer reviewed studies. Note that the numbers in parentheses ([1], [2], etc.) are clickable links to these studies.

If you feel that any of our content is inaccurate, out-of-date, or otherwise questionable, please select it and press Ctrl + Enter.

Reference values of activated partial thromboplastin time (APTT)

Activated partial thromboplastin time (APTT) is one of the most valuable common tests to obtain an idea of the blood coagulation system. APTTV is a test that detects exclusively plasma defects of the internal X-factor activation system in phase I (formation of prothrombinase) of blood coagulation.

Determination of activated partial thromboplastin time - modification of the test for determining the recalcification time of stabilized blood (plasma). It has a higher sensitivity to deficiency of plasma clotting factors (except VII and XIII), however, when using this test, it is not possible to reveal the insufficiency of coagulation activity of platelets.

The elongation of activated partial thromboplastin time (APTT) reflects a deficiency of plasma factors (except VII and XIII) and is observed with their significant (below 25-10%) decrease. Elongation of activated partial thromboplastin time (APTT) indicates a predominance of hypocoagulation.

Reference values: 38-55 s. However, it should be noted that reference values in different laboratories may vary depending on the sensitivity and composition of the diagnostic kits.

trusted-source[1], [2], [3], [4]

You are reporting a typo in the following text:
Simply click the "Send typo report" button to complete the report. You can also include a comment.