| Label Mnemonic: | ENOX |
| Epic code: | LAB316 |
| Order form: | Laboratory Requisition |
| Supply order: | Supply Order Form |
| Billing: | Billing Policies |
| CPT code: | 85520 |
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| Light Blue top tube 1.8 mL (Na Citrate) |
Full draw; 1.8 mL in light blue-top (3.2% sodium citrate) tube. Mix well.
The therapeutic range for low molecular weight heparins (LMWH) varies with the type and manufacturer, but for adults is typically 0.4 – 1.1 U/mL. For adults, the target range for VTE prophylaxis is 0.2 – 0.4 U/mL.
Patient medications must be recorded on the laboratory requisition.
Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.
High doses of low molecular weight heparin with low anti-Xa results could be due to low antithrombin activity.
Anti Xa activity by chromogenic substrate without antithrombin supplementation.
Assay updated to Siemens Innovance reagent on 03/05/19.
0.5 mL platelet poor plasma needed for testing.
Immediately centrifuge specimen at 3500 RPM for 12 minutes.
Using a plastic transfer pipette, carefully remove plasma from cells avoiding the platelet/buffy coat.
Place plasma into a labeled plastic tube.
Centrifuge plasma again at 3500 RPM for 12 minutes.
Remove the top of the plasma and place into a labeled plastic tube.
Freeze double-spun plasma within 4 hours of collection time at -20 degrees C or below.
Place requisition into outside pocket of bag.
Place dry ice on top of specimen in Styrofoam container to maintain frozen temperature.
Samples received thawed will be cancelled.