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aPTTsec

aPTT measures clotting through the other main pathway and is used with heparin therapy.

See your own aPTT on its range.

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What aPTT measures

aPTT measures clotting through the other main pathway and is used with heparin therapy.

If your aPTT is low

A shorter aPTT is rarely notable.

Worth asking your clinician: Nothing specific.

If your aPTT is high

A longer aPTT is expected on heparin and otherwise commonly associated with clotting factor differences or certain antibodies.

Commonly associated with

Worth asking your clinician: What the test was ordered to answer.

Typical reference range

GroupTypical range
Adults24 – 33 sec

Typical adult values used by many US labs. Your own report prints the range your lab validated for its method, and that range is the one that counts. Labwise always uses the printed range first.

If it is within range

Your aPTT is within the range printed by your lab.

Also listed as

PTT, Partial Thromboplastin Time, Activated Partial Thromboplastin Time, PTT, Activated

Related tests

This page is general information about what a laboratory test measures and what results outside a reference range are commonly associated with. It is not medical advice, does not diagnose any condition and does not replace your clinician. Discuss your results with your healthcare provider.