ANTITHROMBIN III ACTIVITY (AT3)

Test Code

LAB311

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%

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.