5947 Heparin (Anti-Xa), Low Molecular Weight (LMWH)

Low Molecular Weight Heparin CHROM  view ref range  IU/mL 

Specimen Requirements
1 Plasma Citrated 1 (0.5) mL   Frozen - 2 Month(s)  

Clinical utility
Monitors dose response to low molecular weight heparin.

Collection Instruction
Instructions for platelet-poor plasma:
1. Draw a plain red-top tube to remove tissue fluid contamination.
Discard this tube.
2. Draw blood into a buffered citrate collection tube (light blue
top) filled to proper level.
3. The blood-to-anticoagulant ratio should be 9:1; inadequate
filling of the collection device will decrease this ratio and
may lead to inaccurate results.
4. Adjust the final citrate concentration in the blood
of patients who have hematocrit values above 0.55 (55%). For
hematocrits below 20%, there are no current data to
support a recommendation for adjusting the citrate concentration.
5. The needle gauge could be between 19-22. For pediatric
patients a 21-23 gauge needle may be used.
6. Invert gently 6 times to mix. Process immediately.
7. Centrifuge for 15 min at 2500 x g.
8. Remove plasma using a plastic pipette to transfer into a
new tube.
9. Repeat centrifugation at 2500 x g for 15 minutes to assure
complete platelet removal.
10. Dispense the plasma into 2 or more plastic tubes using a
plastic transfer pipette. Label tubes appropriately.
11. Freeze immediately at -70 C.
12. Specimen must remain frozen at all times. Ship to Specialty
within 24 hours on dry ice.
13. Specimen should not be submitted if:
* it is hemolyzed
* microclots are present
* the tube is less than 90% filled
* a specimen with hematocrit >55% is collected without
anticoagulant adjustment.

Reported: Same day

CPT Code: 85520

Notes: The Reference Range refers to untreated patients not on LMWH.