Heparin, Quantitative (anti-Xa for unfractionated heparin)

Tube Type = Light Blue Top Tube

Tube Type

Test ID LAB317
EPIC Order HEPARIN-UNFRACTIONATED
CPT Code(s) 85520
Group/Individual Test Individual
Laboratory Core Laboratory
Tube Station 30 Routine: 888 STAT
Specimen Routine: 2.7 mL Blood/Lt Blue Sodium Citrate tube; See Comments
Micro: 1.8 mL Blood Pediatric Lt Blue Sodium Citrate tube
Stability Room Temperature: 4 hours
  Unspun: 1 hour
  Frozen: 14 days (platelet poor plasma only)
Availability Routine: 24 hr/day
STAT: YES
Turnaround Time Stat: 90 min; Routine: 3 hrs
Reference Range

0.3-0.7

For therapeutic range see Anticoagulant Monitoring Testing Guidelines under Laboratory Test Information on McLendon Lab's Website or contact the Heme/Coag Consult pager for the Hematology/Oncology service.

Comment
  • Full light blue top tube
  • Deliver Immediately
  • Draw tube must be allowed to fill completely. Short draws will be rejected.

Reviewed by J. Carr on May 28, 2026