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Mixing Study by PT and/or APTT
Message
Performed in the Hematology Laboratory x5475, 76. Sample MUST be drawn to minimum fill line on tube.
Performed during off hours (after 5 pm daily, weekends and holidays) with Hematology Pathologist approval.
Test Code
PTMX, PTTMX
Alias/See Also
Circulating anticoagulant
CPT Codes
85611 85732
Preferred Specimen
plasma
Minimum Volume
2.7 mL. Sample MUST be drawn to minimum fill line on tube or the sample will be rejected as QNS.
Instructions
If drawn with other coagulation assays: for up to 3 tests draw2, 2.7mL sodium citrate tubes. For 4 or more coagulation tests, draw 3, 2.7 mL sodium citrate tubes.
Transport Container
Light Blue Top (Sodium Citrate), 2.7 mL draw tubes
Transport Temperature
Room temperature
Specimen Stability
Refrigerator Stability: 4 hours
Plasma is stable for 6 months frozen at -70 degrees C.
Plasma is stable for 6 months frozen at -70 degrees C.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis, QNS, Clotted
Methodology
Optical clot detection
Setup Schedule
Monday-Friday from 8-4pm
Reference Range
Negative
Clinical Significance
To evaluate the cause of a prolonged PT and/or APTT (factor deficiency vs. inhibitor)
