Heparin, Quantitative (anti-Xa for unfractionated heparin)

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:	14 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 November 19, 2025

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514