Sign in →

Test Code HEP Anti-Xa Heparin Assay, Plasma

Performing Laboratory

ChristianaCare-Newark Campus

Methodology

Chromogenic Assay

Reference Values

Low Molecular Weight Heparin (LMWH) Therapeutic Goal (3-5 hours post dose):
For patients receiving 1 mg/kg bid= 0.6-1.0 IU/mL
For patients receiving 1.5 mg/kg daily= 0.7-1.5 IU/mL

Unfractionated Heparin (UFH) Therapeutic Goal= 0.3-0.7 IU/mL

Physician Office Specimen Requirements

Container/Tube:  2.7-mL light blue-top (sodium citrate) tube
Specimen:  Full tube - must be filled to exactly 2.7 mL
Collection Instructions: 

Note:  Label tube with patient’s full name and 1 additional unique patient identifier such as date of birth, medical record number, emergency ID number, or financial number. Date and time of draw, collector’s initials, and type of specimen are also required.

Day(s) Test Set Up

Monday through Sunday

Routine Turnaround Time:  4 hours
STAT Turnaround Time:  1 hour