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Test Code PTT Activated Partial Thromboplastin Time (APTT), Plasma

Methodology

Turbidometric

Performing Laboratory

Aspen Valley Hospital

Specimen Requirements

Container/Tube:  Light blue-top (sodium citrate) tube(s)

Specimen:  1 mL of sodium citrate plasma
Collection Instructions:  If there is a delay in transport of >4 hours, spin down and send 1 mL of platelet-poor plasma frozen in plastic vial.

Specimen Transport Temperature

Ambient

Reference Values

Patients not taking anticoagulants:  24.5-36.0 seconds

Critical value (automatic call-back):  >90 seconds (unless patient is known to be on heparin)

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

85730