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HelpActivated Partial Thromboplastin Time (aPTT) Mixing Study
Collection Requirements
Source: blood
Container: Sodium citrate light blue
Volume: 2.7 mL in vacutainer filled to the line
Turn Around Time
STAT: 1 hour
Routine: 4 hours
Clinical Pathologist interpretation: 24 - 72 hours
Availability
STAT
Routine
Algorithm
aPTT will be performed prior to testing
aPTT result must be >42.0 seconds for mixing study to be performed
Lab Processing Instructions
Specimen: plasma
Double spin and separate
Freeze if testing will not be completed within 1 hour of processing
Offsites:
- STAT: Send plasma at room temperature with a STAT courier
- Routine: Send plasma on dry ice
Performing Laboratory
Adele Hall
Adele Hall Lab Section
Hematology
Instrumentation/Methodology
Stago STAR
Reference Ranges
See interpretation
CPT
85732 x3