Anti-Xa Assay

Pathology category

Haematology

Code

XA

Referral code

Request form

Test information

Must be separated within 4 hours of collectionPLEASE NOTE: THIS TEST IS NOT CURRENTLY ACCREDITED UNDER ISO 15189

Guidelines

Pre-analytical

Sample transport should be at 4-25C and reach the laboratory ASAPPlease note: the samples must arrive the same day as collection otherwise they will be rejected by the laboratory

Reference range

Prophylactic range 0.2-0.6 iu/mlTherapeutic range 0.6-1.0 iu/ml

Tube type

Tube type info

2.7 ml Blue top citrate

Special requirements

Specimen should be collected 3-4hrs post dosage of Clexane and tested within 2hrs of collection

Minimum volume

1 tube minimum 90% full – essential to ensure 1:9 ratio of anticoagulant : blood

Assay frequency

TAT Inpatient (urgent)

TAT Inpatient

72 hours

TAT GP/Outpatient

72 hours

Referral lab

local