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Vanderbilt Pathology Laboratory Services

Test Directory



PARTIAL THROMBOPLASTIN TIME (PTT)

Department: Coagulation
Test Synonym(s): aPTT, Activated Partial Thromboplastin Time, PTT
CPT Codes: 85730
Methodology: Clotting
Reference Range: 23-34 seconds
Tube Type: Light blue top (Sodium Citrate)
Specimen: Citrated plasma - platelet poor
Alternate Specimen: None
Pediatric Requirements: Peds - 2.7 mL Neonates - 1.8 mL
Volume: 1.0 mL plasma
Minimum Volume: 1.0 mL plasma
Temperature: Room temperature, or send as a frozen plasma aliquot if sample will not be received into the lab within 2 hours
Stability: Room temperature: 4 hours, if patient is on Heparin: 2 hours
Reasons for Rejection: Clotted sample, incorrectly filled tube, sample sent as whole blood > 4 hours old..CLICK HERE FOR COAGULATION SPECIMEN COLLECTION GUIDE.
Days Performed: Daily
Times Performed: Continuous
TAT: 2 hours, once received into the lab
Special Instructions: Indwelling line should be flushed with saline and 5.0 mL of blood discarded before collecting samples for coagulation assays. Tube must be full and not clotted. Deliver to lab immediately. Samples received from an outside lab must be aliquoted and frozen. Samples aliquoted for shipping must be double centrifuged prior to freezing. Grossly hemolyzed, icteric or lipemic samples may be rejected.


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