Lab Test : Partial Thromboplastin Time

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Alternate:PTT ; APTT ; Activated Partial Thromboplastin Time
Phone:(937) 641-5100
SQ Code:PTTX (PPTT if ordered with PT)
Available:Daily, 24 hours
Turnaround:Routine: 3 hours, STAT: 30 minutes
Volume:1.3 mL
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.
Method:Photo-optical endpoint

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