Days Set Up
Daily, 24 hours
Analytic Time

1 hour

MiChart Code
Aspirin Platelet Function Test
Soft Order Code

Test Updated:


Aspirin Platelet Function Test
Verify Now Aspirin
Aspirin Response
Aspirin Resistance

Looking to order a test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

Automated platelet induced aggregation.

Test Usage

Aid in the detection of platelet inhibition due to aspirin therapy.

Reference Range

Test results are reported in Aspirin Reaction Units (ARU). Therapeutic range for effective platelet inhibition for patients on an aspirin regimen is 350-549 ARU. Values of 550-700 ARU are seen in patients not on aspirin therapy or where therapy is not effectively inhibiting platelet function.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect specimen in a 2.7 mL blue top (citrate 3.2%) tube using a 21 gauge or larger needle;[bold] do not use 1.8 mL tube[/bold]. Mix by inversion. Do not centrifuge. Whole blood specimen should arrive at lab within 3 hours of collection; transport at room temperature. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.

Blue Top Tube
Normal Volume
Full 2.7mL tube
Minimum Volume
Full 2.7mL tube

Billing Information

CPT Code
Pro Fee Code

Have More Questions?

Explore our helpful billing resources:

Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.