Normal Reference Ranges
Adult
30 - 40 seconds
Pediatric
30 - 40 seconds
Clinical Significance
Measures the intrinsic and common coagulation pathways. Primarily used to monitor unfractionated heparin therapy.
Causes of High
- Heparin therapy
- Hemophilia A or B
- von Willebrand disease
- Lupus anticoagulant
- Severe liver disease
Causes of Low
- Not clinically significant
- Early stage DIC
- Extensive cancer