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MIXING STUDIES COAG
Test CodeMIX
CPT Codes
85610, 85730 (x3)
Includes
Plasma Mixing studies are performed to help identify a factor deficiency in the presence of a prolonged PT and/or APTT. Normal plasma is added to the patient's plasma in an even ratio and the mixture assayed for APTT and PT as per protocol. This is a screening test for factor deficiencies and should be followed up with appropriate factor assays in the presence or absence of a correction in the PT or APTT assay.
Preferred Specimen
Collect two mL Platelet poor citrated plasma (3.2 % Na Citrate tube (Blue Top)). 1.0 mL/tube.
Minimum Volume
0.5 mL/tube
Instructions
FILL TUBE TO PROPER LEVEL
Transport Temperature
Room Temperature for In-House Patient
Frozen for Out-Patient
Frozen for Out-Patient
Specimen Stability
Room Temperature: IMMEDIATE
Refrigerated: Unacceptable
Frozen: 7days at -20 C, 90days at -70 C
Refrigerated: Unacceptable
Frozen: 7days at -20 C, 90days at -70 C
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Clotted specimen. Collected in wrong anticoagulant. Wrong blood/anticoagulant ration (under or over filled). Severly hemolyzed.
Last Updated: October 26, 2022
