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Test Code PTT Partial Thromboplastin Time (PTT), Plasma

Methodology

Photometric, Sensitive Synthetic Reagent (SynthASilTM APTT Reagent)
Useful for monitoring heparin therapy, coagulation screening, liver failure, and disseminated intravascular coagulation.

Performing Laboratory

St. Clair Hospital Laboratory

Specimen Requirements

1 light blue-top (3.2% sodium citrate) tube (0.3 mL of sodium citrate plasma) drawn as follows:
1. If patient is on heparin or Coumadin®,  send whole blood unspun at ambient temperature immediately to the lab to be completed in 1 hour. 
2. If patient is not on anticoagulants, send whole blood unspun at ambient temperature. Test must be completed within 4 hours.
Note:  If multiple tubes are being drawn, see “Order of Draw Instructions” in “Specimen Collection, Preparation, and Transport” in “General Information.”

Reference Values

23-36 seconds
Critical value (automatic call-back):  >150 seconds

Day(s) Test Set Up

Monday through Sunday