Anti-Xa Heparin

Test Code

3041007437

Alias/See Also

1231500001

CPT Codes
85520

Includes

ANTI-XA, HEPARIN

Preferred Specimen

Blue Top (Sodium Citrate) tube

Minimum Volume

Fully collected Blue Top tube

Instructions

Fully collect a Blue Top (sodium citrate) tube. Mix sample immediately by gentle inversion at least six times.

Transport Temperature

Send platelet poor plasma Frozen to -20C or less.

To obtain platelet poor plasma: Centrifuge, separate plasma, re-centrifuge, and separate plasma into a transport tube.

Specimen Stability

Refrigerated: 4 hours Frozen: > 4 hours

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Underfilled tubes

Methodology
LR, FS ACL TOP 750 NR CA600 NR Sysmex CS2500 CW Sysmex CA660

Reference Range

Males/Females:
0.10-1.50 U/mL

Performing Laboratory
CONWAY LABORATORY FORT SMITH LABORATORY LITTLE ROCK LABORATORY NORTH LITTLE ROCK LABORATORY

Last Updated: August 26, 2026

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.