|
PTT detects nearly all abnormalities in clotting, due to deficiencies in
clotting factors or circulating anticoagulants.
It is frequently used to monitor heparin therapy.
A modification of the test, "Activated PTT," or APTT, is
basically the same as PTT, but is slightly more sensitive.
Prolonged PTT is associated with:
Therapeutic Range (Heparin Therapy)
|
Normal Values*
| PTT |
30-45 seconds |
| APTT |
16-25 seconds |
|
Therapeutic Range on oral anticoagulants
|
2-2.5 times normal |
*These are general values taken from a variety of
sources. The actual normal values may vary from lab to lab and from one
type of testing protocol to another.
|
Source:
Operational Medicine 2001, Health
Care in Military Settings, NAVMED P-5139, May 1, 2001, Bureau
of Medicine and Surgery, Department
of the Navy, 2300 E Street NW, Washington, D.C., 20372-5300
OB-GYN 101:
Introductory Obstetrics & Gynecology
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