Patient & Visitor Alert: Because flu cases are on the rise, starting February 24, children 12 and younger
will be restricted from visiting hospitals and certain inpatient facilities throughout Carolinas HealthCare System. Learn more.

Carolinas HealthCare System
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FAQs for Hematology and Coagulation

What are the time limits for coagulation test add-ons (PT, APTT)?
24 hours for PT (prothrombin time) and four hours for APTT (activated partial thromboplastin time).