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Laboratory Test Directory
Anti-Factor Xa-Low Molecular Weight Heparin Assay
Components
| Name | Method | Department | Units |
|---|---|---|---|
| Anti-Factor Xa-LMWH Assay |
Chromogenic assay |
Core Lab, Coagulation | U/mL |
Specimen Requirements
Platelet poor plasma
| Container Type | Container Size | Specimen Volume |
|---|---|---|
PreferredBlue plastic tube (Citrate) |
2.7 mL | 2.7 mL |
Stability
Frozen - 2 week(s) |
||
AlternateBlue plastic tube (Citrate) |
1.8 mL | 1.8 mL |
Stability
Frozen - 2 week(s) |
||
Specimen Preparation
- Fill tubes to appropriate mark.
- Mix by gentle inversion immediately after collection
- Centrifuge, remove plasma/serum and freeze
- Plasma must be platelet free
Reasons for Rejection
- Over or under filled tube
- Clotted specimen
- Not received within specified time frame
- Gross hemolysis
- Wrong collection tube
- Capillary specimen
- Specimen collected in glass tube
Comments
This test is indicated for patients receiving Low Molecular Weight Heparin, NOT Unfractionated Heparin. Sample testing will be performed 24/7. Offsite facilities: Centrifuge citrate tubes according to Lab policy, remove platelet-poor plasma, pool the plasma, aliquot and freeze. Send a minimum of two (2) aliquots of plasma.
To view Recommendations for Monitoring Anticoagulant Therapy click here.
CPT Code
- 85520