Activated Partial Thromboplastin Time Test

The activated partial thromboplastin time (APTT) test reflects the activities of most of the coagulation factors and inhibitors. So, its value indirectly tells us about the functioning of various factors involved in coagulation.

Normal Reference Range

  • Full term infant, 0-5 day old 25.0-60.0 seconds
  • Full term infant, 6 days-3 months 24.0-50.0 seconds
  • > 3 months 23.2-33.7 seconds

Test Useful For

  • Monitoring heparin therapy.
  • Screening for deficiencies of certain coagulation factors.
  • Detection of coagulation inhibitors


The values may be affected by certain herbal remedies or medicines such as antihistamines. So, inform your doctor about all medicines being taken.

Activated Partial Thromboplastin Time (APTT)  Lab Report Checker

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Select your Age:
Full term infant, 0-5 day old
Full term infant, 6 days-3 months
> 3 months

Now enter the result of your test report:

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