APTT normal range — check your value

Roughly 25 to 35 seconds, read against the control printed on the report.

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Your APTT test value

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APTT

sec

What APTT measures

How many seconds blood takes to clot through the intrinsic pathway, used to monitor heparin and screen for haemophilia.

APTT normal range chart

ResultAPTT (sec)

Below rangeBelow 25.7

In range25.7 – 33.5

Above range33.5 and above

These bands are for female, 31–45 years. Enter your age and gender above to see the bands for you. The table below shows the range for every age and gender.

APTT normal range by age and gender

AgeMaleFemale

0–1 years25 – 40 sec25 – 40 sec

2–6 years25.7 – 33.5 sec25.7 – 33.5 sec

7–11 years23.8 – 34.8 sec25.7 – 33.5 sec

12–17 years23.8 – 34.8 sec23.8 – 34.8 sec

18–30 years23.8 – 34.8 sec23.6 – 34.8 sec

31–45 years23.8 – 34.8 sec25.7 – 33.5 sec

46–60 years23.8 – 34.8 sec23.8 – 34.8 sec

60 years and above23.8 – 34.8 sec23.8 – 34.8 sec

What a high APTT means, and common causes

Clotting through the other main pathway is slower than normal, which can mean a bleeding tendency or the presence of an inhibitor.

Common causes: Heparin treatment, haemophilia A or B, von Willebrand disease, liver disease, vitamin K deficiency, and lupus anticoagulant.

What a low APTT means, and common causes

A short APTT is rarely significant and is often a sample handling effect.

Common causes: Difficult venepuncture or a clotted sample, and sometimes acute inflammation.

Frequently asked questions

Roughly 25 to 35 seconds, read against the control printed on the report.

They test two different clotting pathways. Which one is prolonged tells the doctor which clotting factors to investigate.

Khoon jamne mein zyada samay lag raha hai. Heparin dawai, liver ki samasya ya clotting factor ki kami kaaran ho sakte hain.

Please note. This page explains what a number means against reference ranges for your age and gender. It does not diagnose anything, cannot see the rest of your report, and is no substitute for a doctor. If your lab’s printed range differs, your lab’s range applies.