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Test Code LAB992 Activated Partial Thromboplastin Time (APTT) Mixing Test, Plasma

Additional Codes

Test Name in EPIC EPIC Test Code Mnemonic



Electromechanical Clot Detection

Specimen Requirements

Specimen Type: Platelet-poor plasma

Collection Container/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.

2. If there is a delay in transport of >1 hour, send specimen frozen.

Specimen Transport Temperature

Refrigerate 1 hour/Frozen OK/Ambient NO

Day(s) Test Set Up

Monday through Friday (day shift only)

Reference Values

Factor deficiencies are corrected with the addition of normal plasma. If an inhibitor is present, the results remain abnormal.

Test Classification and CPT Coding


Performing Laboratory

Coagulation -

East Region: SMDC Clinical Lab

West Region: Fargo Hospital Lab