aPTT (Activated Partial Thromboplastin Time)
aPTT is the clotting time of plasma through the intrinsic pathway. It is used to assess clotting and heparin therapy.
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Normal ranges
Adults: 25–35 s.
Units: s
Causes of deviations
Low levels:
Usually has no meaning.
High levels:
Heparin, clotting factor deficiency, autoimmune disorders.
When to see a doctor
If the value is outside the range, discuss it with your doctor.
Related biomarkers
Panels
Coagulation panel
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