Thrombin Time TT
One adequately filled 3.0 mL light blue (sodium citrate) top tube.
**TIME SENSITIVE** For specimens that cannot be shipped to the laboratory to arrive within 4 hours of collection, see Collection and Processing of Coagulation Specimens information (link below).
Draw blood into the citrate (light blue cap) filled to the proper level (1 part anticoagulant to 9 parts blood). Invert tube 3-4 times to avoid clotting.
|Stability||Ambient and Refrigerated Plasma: 4 hours; Frozen Plasma: 2 weeks|
Specimens that are clotted, collected in the incorrect specimen tube, less than 90% filled, exceed stability limits or hemolyzed are not acceptable for testing.
|Preferred Specimen Collection Device(s)|