Test Code LAB992 Activated Partial Thromboplastin Time (APTT) Mixing Test, Plasma
Additional Codes
Test Name in EPIC | EPIC Test Code | Mnemonic |
---|---|---|
APTT MIXING TEST | LAB992 | PTTMX |
Methodology
Electromechanical Clot Detection
Specimen Requirements
Specimen Type: Platelet-poor plasma
Collection Container/Tube:
Fill Blue top tube to the etched line located just below the cap of the tube.
Preferred: Full Light-blue top (3.2% sodium citrate)
Acceptable: Full Sodium citrate (BD® or Greiner tubes)
Submission Container/Tube: Polypropylene (cloudy plastic ) vials
Specimen Minimum Volume: 1 mL in each of 3 polypropylene (cloudy plastic) vials
Collection Instructions:
1. Unacceptable specimens: Specimens that are short-draws, over-draws, clotted or hemolyzed may yield incorrect results.
2. If sending from a site spin down, remove top 2/3 of plasma, and spin plasma again in a polyproyplene (cloudy plastic) vial.
3. Aliquot top 3/4 and place platelet-poor plasma in a polypropylene (cloudy plastic) vial.
4. Glass vials are not acceptable for processing/transport/storage.
Additional Information:
1. Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.
Specimen Transport Temperature
Frozen OK/Ambient NO/Refrigerate NO
Day(s) Test Set Up
Monday through Friday (day shift only)
Performing Laboratory
Coagulation -
East Region: SMDC Clinical Lab
West Region: Fargo Hospital Lab
Test Classification and CPT Coding
85732
Reference Values
Factor deficiencies are corrected with the addition of normal plasma. If an inhibitor is present, the results remain abnormal.