Anti-Xa for Low Molecular Weight Heparin

Centralized Core Laboratory:Hematology

Test ID/Workstation: LMWH ACOAG

Specimen Type: Blood

Tube Type: Blue top (sodium citrate) tube

Collection Volume: 2.7 mL (minimum 1.8 mL)

Must use appropriate sodium citrate tube based on volume of blood drawn (1.8 mL or 2.7 mL tube)

Storage: Frozen

Availability: Daily; 7:00-3:00

Methodology: Chromogenic Assay

Special Instructions: Send by courier STAT to Hospital lab

Laboratory monitoring of LMWH is usually not necessary. In certain clinical situations (i.e. obesity or renal failure) monitoring may be indicated. Chromogenic anti-Xa assay is the recommended test. This assay should be obtained 4 hours after the dose is administered. Assays within 1 to 2 hours of dose are often very low as are tests > 8 hours after dose. (there is no "steady state") A conservative therapeutic range is 0.6-1.2 IU/mL.

Lab/Phone: 330-543-8418

TAT: 24 Hours

Additional Info: Reference Range:

Prophylaxis: 0.2-0.4 IU/mL

Therapeutic: 0.6-1.2 IU/mL

CPT Code: 85520

Requisition Form
View and print a requisition form for this test

Bookmark and Share

Developments Developments
Sign up for enewsletter
Get involved Get involved
Discover ways to support Akron Children's
Join the conversation Join the conversation
See what our patient families are saying
Contact Us

330-543-1000 (operator)

(8 a.m.-4:30 p.m.)


find a location
Find a location Type the first 3-5 letters of a specialty, service or location:
Or, view: a map, a list of all locations, locations by city or locations near me.
find a doctor
Find a doctor Type the first 3-5 letters of the name, location or specialty:
Or, view a list of all doctors by name, location and specialty.