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HelpActivated Partial Thromboplastin Time (APTT)
Additional Codes
LAB325
Performing Laboratory
MBMC Main Laboratory
Methodology
Absrobance measurement, Clot signature formation
Literature References:
Package insert: SynthASil determination of activated partial thromboplastin time ACL TOP Instrumentation Laboratory, October 2012.
Specimen Requirements
Specimen must arrive and be tested within 4 hours of collection.
Specimen Type: Plasma
Container/Tube: 2.7-mL, light-blue top (sodium citrate)
Specimen Volume: Full tube
Specimen Minimum Volume: Fill to frosted minimal fill line on the tube.
Pediatric 1.0 mL in special pediatrics collection tube- 3.2% sodium citrate. The tube has no vacuum.
Collection Instructions: It is imperative that the tube be completely filled to maintain the proper ratio of blood to anticoagulant.
Specimen Transport Temperature
Ambient/Refrigerate NO/Frozen NO
Day(s) Test Set Up
Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: within 4 hours
Reference Values
PTT: 28 to 38 seconds
MBMC therapeutic heparin range: 66.0 to 100.0 seconds
Critical value (automatic call-back): >120 seconds
Test Classification and CPT Coding
Test Classification:This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer’s instructions.
CPT Code:
85730
Stability
4 hours Ambiant temperature