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HelpTest Code LAB4139 ANTI-Xa ASSAY, LMWH
Specimen Type
Blue top tube (buffered 3.2% liquid sodium citrate) filled to the indicator with whole blood or Sodium Citrate Plasma removed from cells.
Collection Instructions
Fill a Blue Top Container to the Indicator mark on the tube. Overfilled and underfilled tubes are not acceptable.
Specimen Volume
3mL Blue top (3.2% Sodium Citrate)
5mL Blue top (3.2% Sodium Citrate)
1mL Blue top (3.2% Sodium Citrate)
500uL (minimum) Sodium Citrate Plasma spun and removed from cells.Blue top tube (buffered 3.2% liquid sodium citrate) filled to the indicator with whole blood or Sodium Citrate Plasma removed from cells.
Turnaround Time
STAT: 1 hour
Routine: 2 hours
Test Schedule
Daily
Sample Stability
Room temp: 1 hour unspun, 2 hours spun
Frozen 2 weeks
Specimen Processing
Samples should be centrifuged and run within one hour. If time interval between drawing and testing exceeds 1 hour, centrifuge specimen, separate plasma, centrifuge again, separate into plastic tube and freeze at -20C or less.
Method
AntiXa Chromogenic
Reference Ranges
LMWH therapeutic ranges:
0.50-1.00 IU/mL for twice daily dosing*
1.00-2.00 IU/mL for once daily dosing*
LMWH prophylactic range:
0.10-0.30 IU/mL *sample obtained 4-6 hours following subcutaneous injection
LMWH Critical range:
Greater than 2.00
Synonyms
Anti-Xa; LMWH Assay;
Anti-Factor XA Assay;
Anti Xa; Lovenox;
Enoxaparin; Fragmin;
Low Molecular Weight Heparin
CPT Codes
85520
Rejection Criteria
Severely hemolyzed specimens, clotted samples