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Partial thromboplastin time (PTT)





Partial thromboplastin time (PTT)

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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