Enoxaparin Assay (Anti Xa)
| Label Mnemonic: | ENOX |
| Epic code: | LAB316 |
| Order form: | Laboratory Requisition |
| Supply order: | Supply Order Form |
| Billing: | Billing Policies |
| CPT code: | 85520 |
Specimen(s):
Citrated Plasma More information
Collection Medium:
 |
| Light Blue top tube 1.8 mL (Na Citrate) |
Minimum:
Full draw; 1.8 mL in light blue-top (3.2% sodium citrate) tube. Mix well.
Testing
Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around
Time:
2 hours (upon receipt in laboratory)
Reference Range:
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.
Comments:
Patient medications must be recorded on the laboratory requisition.
Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.
Instrumentation changed from BCS-XP to CS-5100 on 12/16/2019.
Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.
Instrumentation changed from BCS-XP to CS-5100 on 12/16/2019.
Methodology:
Anti Xa activity by chromogenic substrate without antithrombin supplementation.
Assay updated to Siemens Innovance reagent on 03/05/19.
Assay updated to Siemens Innovance reagent on 03/05/19.
Instructions:
0.5 mL platelet poor plasma needed for testing.
Sample
Processing:
Centrifuge within four hours of draw time.
Centrifuge at a speed and time necessary to get barrier separation of plasma/serum and cells.
Separate plasma into plastic container and cap (glass is not acceptable).
Centrifuge a second time to ensure platelet poor plasma and separate plasma into a new, labeled plastic tube, cap.
Centrifuge at a speed and time necessary to get barrier separation of plasma/serum and cells.
Separate plasma into plastic container and cap (glass is not acceptable).
Centrifuge a second time to ensure platelet poor plasma and separate plasma into a new, labeled plastic tube, cap.
Sample
Storage:
Freeze specimen immediately.
Transport
Instructions:
Place labeled specimen into zip-lock type biohazard bag; seal bag.
Place requisition into outside pocket of bag.
Place dry ice on top of specimen in Styrofoam container to maintain frozen temperature.
Place requisition into outside pocket of bag.
Place dry ice on top of specimen in Styrofoam container to maintain frozen temperature.
CPT Code:
85520