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Unfractionated Heparin
(a.k.a UFH, Heparin, Xa, Anti-Xa)
minimum sample volume required ~ 2.7ml
Special instructions
Citrate sample to be collected 4-6 hours after initiation or dose adjustment.
Please note: Sample must be received in laboratory within 1 hour of collection.
Warning: Blood samples taken through in situ lines cannot be accepted as they are commonly contaminated with unfractionated heparin.
Urgent samples will be analysed within one hour from receipt of sample, laboratory must be informed prior to receiving sample.
Contact Laboratory before requesting
Reference range
0.35-0.70
Units
IU/mL
Linked to
Anti-Xa
Turnaround Time
24
hours
Department: Haematology
Clinical Application
The aPTT remains the most commonly used method for monitoring UFH. However, if the heparin anticoagulant effect is being masked by variability in clotting factors the anti-Xa assay may be useful.
Recommend advice from clinical haematologist before requesting assay. Please inform the haematology laboratory prior to sending sample.
