COVID-19 information for patients and families

To help protect our people, patients and communities, we are screening everyone who enters our main hospital buildings. Some of our entrances may be closed or have reduced access.

Please check our COVID-19 information page for more updates before coming to our sites.


Text size: a a a

Laboratory Medicine

Test catalogue

Anti-Xa Activity (LMWH)

Test Name

Anti-Xa Activity (Low Molecular Weight Heparin, LMWH)

Blue Tube Specimen Type / Requirements

Container Type = Blue (Sodium Citrate)

Minimum Volume = Full draw

9:1 Ratio (9 parts blood to 1 part anticoagulant)

Specimen Handling

Collection Instructions: Must indicate anticoagulant status to avoid delay. Write your initials, date and time of collection on the collection label.

Transportation: In/Outpatients: Send whole citrated blood at room temperature as soon as possible. Referred-in: Send frozen citrated plasma on dry ice. All samples must be sent to the Core Laboratory.

Stability: Specimens are stable for 4 hours post collection at room temperature. Specimens which are not tested within 4 hours can be double-spun to remove the citrated plasma. The citrated plasma is stable at -20°C for up to two weeks or -70°C for up to six months.

Sample Rejection Criteria: Clotted sample, grossly hemolyzed samples, Unlabeled or samples with insufficient quantity will be rejected.

Required Documentation

Turnaround Time (TAT)

STAT: 4 hrs

Routine: 1 day

Test Utilization

Reference Value

Suggested theraputic range for patient samples drawn 4 hours post SC injection only:

0.60 - 1.10 U/mL (twice/day injection)

1.00 - 2.00 U/mL (once/day injection)

Test Code

LMWH

Methodology

Chromogenic Assay

Testing Location

SMH-Routine Coagulation

Other information

Last Updated: June 06, 2019