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HelpActivated Partial Thromboplastin Time (aPTT)
Collection Requirements
Source: blood
Container: Sodium citrate light blue
Volume: 2.7 mL in vacutainer filled to the
line
Special Instructions
If patient's hematocrit is >55%, call Hematology for special collection tube
Turn Around Time
STAT: 1 hour
Routine: 4 hours
Availability
STAT
Routine
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
| Age (days) | Reference Range (seconds) |
|---|---|
| 0-5 | 31.1 - 48.1 |
| 6-30 | 29.4 - 45.7 |
| 31-180 | 26.8 - 41.5 |
| > 180 | 24.5 - 37.5 |
CPT
85730