ANTITHROMBIN III ACTIVITY (AT3)
: Antithrombin Activity, AT3, AT
: 75 - 140%
: Light blue top (Sodium Citrate)
: Citrated plasma - platelet poor. This sample requires double centrifugation if sending a plasma aliquot
: Peds - 2.7 mL, Neonates - 1.8 mL
: 1.0 mL plasma
: 1.0 mL plasma
: Room temperature or send as a frozen plasma aliquot if sample will not be received into the lab within 4 hours
: Refrigerated - 4 hours, frozen at -70C - one month
Reasons for Rejection
: Clotted sample, incorrectly filled tube, grossly hemolyzed plasma, grossly lipemic plasma, sample sent as whole blood >4 hours old.
: 4 hours
: Direct Thrombin and Indirect anti-Xa inhibitors may interfere with this assay.
: Indwelling line should be flushed with saline and 5.0 mL of blood discarded before collecting samples for coagulation assays. Tube must be full and not clotted. Deliver to lab immediately. Samples received from an outside lab must be aliquoted and frozen. Samples aliquoted for shipping must be double centrifuged prior to freezing. Grossly hemolyzed, icteric or lipemic samples may be rejected.
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