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Activated Partial Thromboplastin Time (aPTT)
Test CodeAPTT
Alias/See Also
Epic: LAB2207
CPT Codes
85730
Preferred Specimen
Specimen Type: Platelet-poor plasma
Collection Container: Light blue top (citrate)
Specimen Volume: 1 mL
Minimum Volume
1 mL
Other Acceptable Specimens
Specimen Type: Whole blood, citrate
Collection Container: Light blue top (citrate)
Instructions
- Centrifuge, remove plasma and centrifuge again.
- Aliquot plasma into plastic vial leaving 0.25 mL in the bottom of centrifuged vial.
For complete instructions, see Platelet Poor Plasma Instructions.
Transport Container
Plastic vial
Specimen Stability
Platelet-poor plasma
Room temperature
Outpatient: 12 hours
Inpatient: 4 hours
Refrigerated: Unacceptable
Frozen (-20ºC): 2 weeks
Frozen (-70ºC): 6 months
Whole Blood
Room temperature
Outpatient: 12 hours
Inpatient (not on heparin): 4 hours
Inpatient (on heparin): 1 hour
Refrigerated: Unacceptable
Frozen: Unacceptable
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Samples that are short (QNS), over draws, clotted, hemolyzed, or beyond stablility requirements may yield incorrect results
Methodology
Coagulometric (Turbidimetric)
Setup Schedule
Daily
Report Available
Same day
Reference Range
23 - 37 seconds
Performing Laboratory
Inova Laboratories
2832 Juniper Street
Fairfax, VA 22031
Last Updated: March 6, 2023
Last Review: N. Wolford, March 6, 2023