Laboratory Test Detail

Last Updated: June 18, 2024 @ 9:13 am


Partial Thromboplastin Time

  • One Blue Top (Na Citrate)
  • 1 mL (Min:0.5 mL) Plasma . Submit Frozen. Submit in a Standard Transport Tube.
Special Handling:
  • If patient is on Heparin Therapy separate plasma from cells within 1 hr, plasma is stable for 2 hrs ambient.
    Patients that are on therapeutic coagulation drugs, including but not limited to Rivaroxaban, Apixaban, Edoxaban, Dabigatron, Vit K antagonists, and Unfractionated Heparin, are known to cause interference with testing. Discontinue drugs for a minimum of 24 hours prior to any aPTT testing.
Rejection Criteria:
  • Clotted Specimen
  • Grossly Hemolyzed Samples
  • Collection tubes not properly filled
Stability:Ambient: 4 Hour(s); Refrigerated: Unacceptable; Frozen: 2 Week(s); Incubated: Unacceptable
  • Mechanical Clot Detection
Reported:1-3 Day(s)
CPT Codes:
  • 85730
Interpretive Data:General Reference Range : 22.9-41.3 sec
  • 3505 - PTT
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