|Alternate:||PTT ; APTT ; Activated Partial Thromboplastin Time|
|SQ Code:||PTTX (PPTT if ordered with PT)|
|Available:||Daily, 24 hours|
|Turnaround:||Routine: 3 hours, STAT: 30 minutes|
|Container:||Blue top tube (3.2% sodium citrate)|
|Temperature:||Transport to the laboratory within 30 minutes of collection.|
|Rejection:||Tube not filled to line, specimen hemolyzed, clotted, or not received within 30 minutes of collection.|
|Normal:||6 months to adult. 25.7-37.8 seconds. Ranges not established for under 6 months of age.|
|Uses:||Evaluation of intrinsic and common pathway of the coagulation system and it is useful in monitoring heparin therapy. Aid in screening presence of classical Hemophilia A and B, Christmas disease, congenital deficiencies of factors II, V, IX, XI, and XIII. Screening for disseminated intravascular coagulation, for liver failure, for congenital hypofibrinigenemia; and for vitamin K deficiency; aid in screening for congenital deficiency of prekallikrein (Fletcher Factor).|
|Limitations:||Hemolysis significantly shortens the partial thromoplastin time in normal but not abnormal persons. Fibrinogen levels below 80 mg/dl may result in an abnormal APTT.|
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