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HelpTest Code PTT Activated Partial Thromboplastin Time (APTT), Plasma
Performing Laboratory
Lima Memorial Health System Laboratory
Specimen Requirements
Container/Tube: Blue Top (Na-citrate) tube
Minimum Volume: Must be full
Collection Instructions: Specimens from patients undergoing heparin therapy must arrive within 1 hour of draw and 4 hours for non-heparinized patients.
Reference Values
23.0-38.0 seconds
Alarm value (automatic call-back): ≥100.0 seconds
Specimen Stability
Ambient: 4 hours
Frozen: aliquot, freeze up to 2 weeks
Day(s) Test Set Up
Monday through Sunday
Methodology
Photo Optical
Test Classification and CPT Coding
85730
Mnemonics
PTT, APTT