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From , former About.com Guide

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ENCYCLOPEDIA INDEX
Injury Disease Nutrition Poison Symptoms Surgery Test Special Topic
1 2 5 A B C D E F G H I J K L M N O P Q R S T U V W X

Partial thromboplastin time (PTT)

Overview Risks Results
Alternative Names:
APTT; PTT; Activated partial thromboplastin time
Normal Values:
  • APTT: 25 to 35 seconds

The normal value will vary between laboratories.

  • Patients receiving anticoagulant therapy: 1.5 to 2.5 times control values
What abnormal results mean:
Prolonged PTT may indicate:

This test may be used in the evaluation of a wide variety of disorders.

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