Prothrombin Time (PT) PT - Laboratory Alliance

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Prothrombin Time (PT) PT
Method(s) Clot Detection
Specimen Required
Collect

One adequately filled 3.0 mL light blue (sodium citrate) top tube.
Transport 3 mL whole blood at 20-25ºC.
Remarks

Draw blood into the citrate tube (light blue cap) filled to the proper level (1 part anticoagulant to 9 parts blood). Invert tube 3-4 times to avoid clotting.
Stability Ambient: 24 hours
Unacceptable Conditions

Specimens that are clotted, hemolyzed, collected in the wrong tube or less than 90% or greater than 110% filled.
Schedule Daily-24 hours per day
Billing Code 4010049
CPTCode 85610
  • PDF Collection and Processing of Coagulation Specimens
Preferred Specimen Collection Device(s)
Reference Interval

9.2 - 11.9 seconds

Suggested Therapeutic ranges using INR for stabilized anticoagulated patients: Standard Dose Therapy INR 2.0-3.0 DVT, PE, Prevent DVT or Embolism. High Dose Therapy INR 2.5-3.5 Prevent Embolism from Mechanical Heart Valve.
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