PTT; Activated PTT

LAB325

PTT; APTT; Activated Partial Thromboplastin Time

Partial thromboplastin time (Patient Plasma) in seconds, Partial thromboplastin time (Patient Plasma plus Normal Plasma) in seconds

"Routine venipuncture;
Collect one 2.7ml Blue top (sodium citrate) 90% of tube must be filled.
 do not use syringe for collection."

Room temperature, stable 12 hours.

Tube <90% full; visible hemolysis; clotted specimen; improperly labeled specimen

Daily

Urgent: 4 hours; inpatient STAT: 1 hour; outpatient STAT: 2 hours

24.1-37.4 Sec  ; Critical: 45.1 Sec

"The PTT test is used to investigate unexplained bleeding or clotting. It may be ordered along with a PT (Prothrombin Time) test to evaluate hemostasis, the process that the body uses to form blood clots to help stop bleeding. The PTT evaluates the coagulation factors XII, XI, IX, VIII, X, V, II (prothrombin), and I (fibrinogen) as well as prekallikrein (PK) and high molecular weight kininogen (HK). A PT test evaluates the coagulation factors VII, X, V, II, and I (fibrinogen). By evaluating the results of the two tests together, a doctor can gain clues as to what bleeding or clotting disorder may be present. A PTT is often used to monitor standard (unfractionated, UF) heparin anticoagulant therapy. Heparin is a drug that is given intravenously (IV) or by injection to prevent and to treat thromboemboli. When it is administered for therapeutic purposes, it must be closely monitored. If too much is given, the treated person may bleed excessively; with too little, the treated person may continue to clot.
Click here to see the COAGULATION TESTING ALGORITHM"