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HelpTest Code LMWH Low Molecular Weight Heparin
Additional Codes
LAB316
Performing Laboratory
Central Peninsula Hospital
Collection Instructions
Properly filled 9:1 ratio (blood to anticoagulant); 3.2% NaCitrate tube
Collection Method
Venipuncture
Container
Light Blue Sodium Citrate
Specimen Type
Preferred
- 2.7mL Lt. Blue (3.2% NaCitrate) tube
Acceptable
- 1.8 mL Lt. Blue (3.2% NaCitrate) tube
Minimum Volume
0.5 ml of plasma from a properly filled 1.8 mL or 2.7 mL NaCitrate (light blue) tube
Specimen Stability
| Ambient | 2 hrs unopened specimen |
| Refrigerated (4°C to 8°C) | N/A |
| Frozen(-70°C) | 6 months for separated plasma |
Reference or Target Ranges
LMWH: 0.50 – 2.00 IU/mL
Report Comment:
Therapeutic Anti-Xa Range (Enoxaparin):
• Twice daily dosing: 0.50–1.00
• Once daily dosing: 1.00–2.00
Reportable Units
IU/mL
Critical Value
>2.0 IU/mL
Reasons for Rejection
| Hemolysis Threshold | If visible – reject |
| Icterus Threshold | If visible – reject |
| Lipemia Threshold | If visible – reject |
| Interfering Subtances/Other | Short draws, over draws, clotted, improperly labeled, hemolyzed, lipemic or icteric samples |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
Stat:1 hour on arrival to lab Routine:4 hours on arrival to lab |
| Stat Availability | Yes |
| Performing Bench | Coagulation |
| Methodology/Method Description | UH: Stago MAX |
CPT Codes
85520
Last review/edit date
2025