Heparin, Low Molecular Weight (Xa Inhibition)
| Order Code: | ENOX |
| Order Form: | Laboratory Requisition |
Specimen:
Citrated Plasma
Collection Medium:
 |
| Light Blue top tube 1.8 mL (Na Citrate) |
Minimum:
Draw ONE 1.8 mL in light blue-top (3.2% sodium citrate) tube.
0.5 mL platelet poor plasma needed for testing.
0.5 mL platelet poor plasma needed for testing.
Testing
Schedule:
0800-1630 Monday through Friday.
Turn Around
Time:
8 hours (upon receipt in laboratory)
Reference Range:
Therapeutic range: 0.3-0.7 IU/mL for unfracionated heparin. The
therapeutic range for low molecular weight heparins varies with the
type and manufacturer, but is typically between 0.4 and 1.1 IU/mL.
Comments:
Scheduled through Hematology consult Service.
Patient medications must be recorded on the laboratory
requisition.
Test
Limitations:
Double-centrifuged specimens are critical for accurate results as
platelet contamination may cause spurious results.
Methodology:
Chromogenic method
Sample
Processing:
Centrifuge at 3500 RPM for 10 minutes.
Centrifuge a second time at 3500 RPM for 10 minutes and aliquot into a new, labeled plastic tube.
Aliquot plasma into plastic container and cap (glass is not acceptable).
Centrifuge a second time at 3500 RPM for 10 minutes and aliquot into a new, labeled plastic tube.
Aliquot plasma into plastic container and cap (glass is not acceptable).
Sample
Storage:
Freeze specimen immediately.
Transport
Instructions:
Place dry ice on top of specimen in styrofoam container.
CPT Code:
85520