Specimen:

Plasma

Collection Medium:

Minimum:

Full draw; any size blue top

Rejection Criteria:

Short drawn tube, clot, traumatic tap (excessive hemolysis).

Testing
Schedule:

0800-1630 Monday through Friday.

Analytic Time:

24-36 hours

Reference Range:

Greater than 50%

Therapeutic reference range is 11-42%

Test
Limitations:

This test is to be used for coumadin monitoring of patients with 
positive Lupus anticoagulants.

Methodology:

Activity detection by chromogenic substrate

Sample
Processing:

Centrifuge within two hours of draw time.
Aliquot plasma into plastic container and cap (glass is not 
acceptable).
Centrifuge a second time at 3500 RPM for 10 minutes and aliquot into a 
new, labeled plastic tube.

Sample
Storage:

Freeze specimen immediately.

Transport
Instructions:

Place specimen into zip-lock type bag, seal bag.
Place requisition into outside pocket of bag.
Place dry ice on top of specimen in styrofoam container.

CPT Code:

85260

See also:
Coagulation Factor Assays, Plasma

See Additional Information:
Phlebotomy Tubes and Order of Draw