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Test Code MIXSDY Mixing Studies (Coagulation Inhibitors), Blood, LAB2614


Clot Based Assay

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred:  3 Full blue-top (sodium citrate) 1.8mL tube-Hemolyzed or short draw specimen is not acceptable.
Specimen: minimum volume: 2.0mL plasma

Stability: Specimens at 18-20°C must be tested within 4 hours of specimen collection

Transportation:  Centrifuge, aliquot and freeze the specimen at -20°C.  Stable for up to 2 weeks.


NOTE: Patient cannot be on heparin or Coumadin.

NOTE: Patients with a hematocrit of >55% must be recollected using an altered amount of sodium citrate.

Reference Values

Refer to Protime and PTT for reference values

Day(s) Test Set Up

Monday through Friday (days only)

Test Classification and CPT Coding

85611-PT mix
85732-APTT mix

Useful For

The presence of acquired circulating anti-coagulants is commonly associated with certain disease entities, ingestion of drugs, and other clinical situations.  Acquired inhibitors can occur in patients with non-congenital deficiencies.

Analytic Time

1-2 days.