| Primary
Name |
Anti-Xa |
| Synonym |
Unfractionated
Heparin Anti-Xa Assay |
| Synonym |
Low
Molecular Weight Heparin Anti-Xa Assay |
| Contraction |
Heparin
Assay |
| Contraction |
UFH
Anti-Xa Assay |
| Contraction |
LMWH
Anti-Xa Assay |
| UAB
Procedure Number |
2500670 |
| CPT
Code |
85520 |
| Specimen |
Collect
one (1) blue-stopper tube (3.2% sodium citrate), filled to specified
volume. Do not underfill or overfill.
|
| Specimen
Management |
Centrifuge
blue-stopper tube within 1 hour of collection, separate
plasma and test or quick-freeze at -70°C. |
| Specimen
Accepted |
Daily
including weekends |
| Times
Available |
0730-1600;
deliver to lab by 1300 for same-day results |
| Test
Performed |
Monday-Friday |
| Available
Stat? |
Pathologist's
approval required. |
| Description |
The
anti-Xa test is the most accurate assay for monitoring unfractionated
heparin therapy and is the only assay available for monitoring low molecular
weight heparin (Lovenox®) and heparin analogues (Danaparoid®).
Specify type of heparin used when ordering test. |
| Reference
Interval |
0.0
anti-Xa heparin units per mL plasma. |
| Critical
Value |
-- |
| Therapeutic
Range |
*Therapeutic
unfractionated heparin: 0.3 - 0.7 anti-Xa units per mL plasma.
*Prophylactic unfractionated heparin: 0.1-0.4 anti-Xa units per mL plasma.
*Low molecular weight heparin: 0.4 to 1.0 anti-Xa units per mL plasma
for therapy.
*Low molecular weight heparin: 0.2 to 0.4 anti-Xa units per mL plasma
for prophylaxis. |
| Follow-up
Test |
-- |
| Associated
With |
Heparin
therapy |
