Partial thromboplastin time

Partial thromboplastin time is a topic covered in the Guide to Diagnostic Tests.

To view the entire topic, please or purchase a subscription.

Emergency Central is a collection of disease, drug, and test information including 5-Minute Emergency Medicine Consult, Davis’s Drug, McGraw-Hill Medical’s Diagnosaurus®, Pocket Guide to Diagnostic Tests, and MEDLINE Journals created for emergency medicine professionals. Explore these free sample topics:

Emergency Central

-- The first section of this topic is shown below --


Partial thromboplastin time, activated, plasma (aPTT)

25–35 seconds


Panic: ≥60 seconds (off heparin)



Do not contaminate specimen with heparin.

-- To view the remaining sections of this topic, please or purchase a subscription --