PARTIAL THROMBOPLASTIN TIME

Synonyms: PTT; APTT
Computer Code:
Specimen Collection: 2.7 mL (blue top tube) 90% full
Minimum Volume: 1.8 mL (blue top tube) 90% full
Handling Instructions for Offsite Areas: Maintain at room temperature. If specimen cannot be transported within 2 hours, centrifuge at 3,000 rpm for 20 minutes. Using a plastic pipette, transfer plasma to plastic tube and freeze plasma.
Reference Values: 25.0-38.0 seconds
Lab Code: HEM
Requisition: C/H
Test Frequency: Daily
Routine TAT: NA
Stat TAT: 60 min
CPT Code(s): 85730
LCD or NCD:
Methodology Used:
See Addendum XVII