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ANTITHROMBIN III ACTIVITY (AT3)
Test CodeLAB311
CPT Codes
85300
Preferred Specimen
5 mL whole blood in blue top tube; Outreach should separate plasma and send frozen.
Instructions
Blue-top tubes (3.2% Sodium Citrate) must be completely filled (to the 'fill-line'). If a Blue-top tube is the only tube being collected, it is recommended that you draw and DISCARD a minimum of 5 mL prior to collecting. If a specimen must be collected through an indwelling catheter, the line should be flushed with 5 mL of saline and the first 5 mL of blood (or six dead space volumes of the catheter) discarded prior to drawing the testing specimen. If a specimen is drawn from an I.V. or arterial line, the I.V. must be turned off for at least 2 minutes and a minimum of 15 mL of blood discarded PRIOR to drawing this tube.
Transport Container
Blue top tube
Transport Temperature
Frozen on dry ice
Reference Range
16 y - adult: 83% - 128%