Investigation Name:Low Molecular Weight Heparin Assay (FXa Assay)

Alias or Abbreviation:FXA, Heparin assay

Pathology Laboratory:Haematology Ext 88245

Requestable Seperately?No

Units:iu/ml

Minimum Sample Volume:FILL TO LEVEL

Expected Turnaround Time:<2 days

Test Code:HEPA

Sample Type:

Maximum Add on Time:4 hours

Complex Reference Range:Prophylactic range for LMWH 0.3-0.5 Therapeutic ranges: LMWH 0.5 – 0.9 IU/mL UFH 0.3 - 0.7 IU/mL Orgaran 0.5 – 0.8 IU/mL

Collection Conditions / Other Information:Full sample must be taken 4 hours post LMWH administration and tested within 4 hours. Please state which anticoagulant patient is on as different calibration curves exist for the different preparations. Paediatric sample tubes are available from the laboratory for children and difficult to bleed patients. These tubes require 1ml of blood to be taken. Underfilled or overfilled samples will not be processed as the ratio of anticoagulant to blood in the tube will be incorrect. Clotted and grossly haemolysed samples cannot be processed. Haemolysis, Icterus and lipaemia may interfere with testing and so manual methods may be required to gain results.

Referred to Another Laboratory?No