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
(Synonym: Unfractionated Heparin Level, Anti-Xa Level, Anti Xa, Anti XA Level, Low Molecular Weight, LMWH, UNFH, UFH)

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.

Collection Alert:

All Hospitals (Inpatients and Outpatient collection labs) can collect. For community Patient Service Centres (PSC), testing can ONLY be collected at the PSCs listed below.

Shipping and Handling Alert:

Specimens are time sensitive.

Calgary Zone: Samples must be hand-delivered. Pneumatic Tube or Electronic Tracked Vehicle (eg. Telelift) systems must NOT be used for transport.

LABID (Connect Care):

LAB316

Specimen Type:

Blood

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.

All Hospitals (Inpatients and Outpatient collection labs) can collect. For community Patient Service Centres (PSC), testing can ONLY be collected at the PSCs listed below.
Edmonton Zone:	Meadowlark Patient Service Centre Northgate Patient Service Centre Heritage Patient Service Centre Tawa Patient Service Centre Windermere Patient Service Centre Leduc Patient Service Centre Athabasca Place (Sherwood Park) Patient Service Centre
Central Zone:	Camrose Patient Service Centre Red Deer Downtown Patient Service Centre Red Deer Bower Plaza Patient Service Centre Lloydminster Patient Service Centre
North Zone	Franklin (Fort McMurray) Patient Service Centre Grande Prairie Patient Service Centre
Calgary Zone:	All Calgary Zone Patient Service Centres
South Zone:	Medicine Hat Patient Service Centre Lethbridge Centre Village Patient Service Centre Lethbridge Highlands Patient Service Centre Brooks Patient Service Centre
Mobile	Test cannot be collected by Mobile Collection Service (MCS).

Test Resources:

General Laboratory Requisition – 21302

Stability and Storage:

Central and Edmonton Zones: Room temperature - 3.5 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, using a plastic pipette, into 2 polypropylene aliquot tubes and freeze
Each aliquot must be at least 0.5 mL
Platelet poor plasma must be prepared in accordance with the College of Physician and Surgeons of Alberta (CPSA) Laboratory Standard H.4.3.4. This must include procedures for regular verification that centrifuge(s) reliably produce plasma containing <10 x 10⁹/L residual platelets. Please contact Special Coagulation in Calgary 403-770-3598 (ext 3) or in Edmonton 780-407-8487 for detailed instructions.

Transportation:

Room temperature – uncentrifuged
Frozen (dry ice if available) - Specimens must maintain frozen state for entire duration of transport.

Testing Schedule:

Daily

Stat testing is available at performing sites.

Reference Interval:

See Laboratory Report.

Critical Value:

See Laboratory Report.

Testing Area:

Hematology

Performing Site:

Calgary Zone:	Foothills Medical Centre
Edmonton Zone	Grey Nuns Hospital Misericordia Hospital Royal Alex Hospital Sturgeon Hospital University of Alberta Hospital
North Zone	Grande Prairie QE II Regional Hospital

Contact Comments:

1-877-868-6848

Last Updated On:

Wednesday, December 4, 2024