Correction Studies PTT*
Methodology
Photo-Optical
Performing Laboratory
Rutland Regional Medical Center Laboratory
Specimen Requirements
Specimen Type: Whole blood
Container/Tube: Light-blue top (citrate)
Specimen Volume: 2 full tubes
Specimen Minimum Volume: 5.4 mL
Collection Instructions:
1. Tubes must be full. (Do not underfill or overfill tubes.)
2. Send specimen in original tubes.
Additional Information: Plasma is stable for 4 hours when refrigerated.
Specimen Transport Temperature
Refrigerated
Reference Values
22.4-35.9 seconds
Critical value (automatic call-back): >130 seconds
Day(s) Performed
Daily
Analytical Time:
1 day
Test Classification and CPT Coding
85730-PTT
85732-PTT substitution, plasma fractions, each