Alberta Precision Laboratories

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Organization:

Alberta Precision Laboratories

Message Alert:

PLEASE NOTE: This Test Directory is in an interim state and due to changes pertaining to the DynaLIFE transition, performing site for routing has not been updated. Please refer to Laboratory Information System for appropriate routing.

Test Name/Synonym:

Anti-Xa Heparin Level - Edmonton Zone and North Zone
(Synonym: HEPFXA, Unfractionated Heparin, LMWH, Low Molecular Weight Heparin, UNFH, Anti Xa)

Clinical Indications:

This test can be used to monitor Unfractionated Heparin or Low Molecular Weight Heparin dosing. It is not calibrated for dose adjustment of fondaparinux, rivaroxaban, apixaban or other Factor Xa inhibitors but it can be useful to assess for whether these drugs are present. An undetectable result means none of these medications are present in significant quantity.

Shipping and Handling Alert:

Specimens are time sensitive.

LABID (Connect Care):

LAB316

Test Code:

EDMONTON ZONE:	UNFH, LMWH
NORTH ZONE:	LMWH2, LMWHRO

Specimen Type:

Blood

Specimen Source:

Arterial, Venous, Central Line, ECMO

Primary Container:

LT BLUE CITRATE

Minimum Collection Volume:

Adults: One 2.7 mL LT blue citrate tube, allow the vacuum tube to completely fill, minimum fill is to frosted line on tube.
Pediatric and Neonate: One 2.7 mL or 1.8 mL LT blue citrate tube, allow the vacuum tube to completely fill, minimum fill is to frosted line on tube.

Specimen Collection Requirements:

It is important to fill tube to maximum draw.
Collect 4-6 hours post dose.
If continuous infusion, collection can be performed at any time.
Mix well immediately after collection by inverting tube 3 to 4 times.
Must be collected by venipuncture. If venous access not available, sample can be drawn from a line but 6x the volume of the line or 5 mL (whichever is less) must be removed prior to collection.
When using a winged blood collection set (butterfly needle), a discard tube must be used to remove the air in the tubing, if only a citrate tube is drawn or is the first tube drawn.

Test Resources:

General Laboratory Requisition – 21302

Stability and Storage:

Central and Edmonton Zones: Room temperature - 4 hours
North Zone: Room temperature - 2 hours

Processing:

For specimens that will be received beyond stability:

Centrifuge to obtain platelet poor plasma (platelet count <10 x 10*9/L)
Aliquot plasma into 2 plastic aliquot tubes and freeze
Each aliquot must be at least 0.5 mL

Transportation:

Room temperature – uncentrifuged
Frozen (dry ice if available)

Routine Turn Around Time:

Stat testing is available at performing sites.

Testing Schedule:

Daily

Reference Interval:

See Laboratory Report.

Critical Value:

See Laboratory Report.

Testing Area:

Hematology

Performing Site:

Edmonton Zone	Grey Nuns Hospital, Misericordia Hospital, Royal Alex Hospital, Sturgeon Hospital, University of Alberta Hospital
North Zone	Grande Prairie QE II Regional Hospital or referred to University of Alberta Hospital

Contact Comments:

1-877-868-6848

Last Updated On:

Monday, December 5, 2022