Ristocetin Cofactor Activity RISTO
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 light blue (sodium citrate) top tube filled to the proper level (1 part anticoagulant to 9 parts blood). Invert tube 3-4 times to avoid clotting.
|Stability||Ambient, Refrigerated: 4 hours; Frozen platelet-poor plasma: 2 weeks.|
Specimens that are clotted, hemolyzed, collected in the wrong tube, less than 90% filled, exceed stability limits or non-frozen plasma are unacceptable for testing.
|Notes||Anticoagulant therapy may interfere with test results.|
|Preferred Specimen Collection Device(s)|