Geisinger Medical Laboratories Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  


Geisinger Epic Procedure Code: LAB1788             Geisinger Epic ID: 43808

Specimen type:
Whole blood
Preferred collection container:
Specimen required:
TWO 2 mL 3.2% sodium citrate blue-top tubes are required for each test.
Special notes:
Collect TWO sodium citrate tubes. Draw this tube prior to any other anticoagulant or additive tubes. Walk tube to laboratory (do not send via pneumatic tube or courier).

Perform venipuncture with no trauma. If blood is drawn from indwelling catheter, flush with 5mL of saline and discard the first 5 mL of blood collected to avoid contaminating sample with tissue thromboplastin or heparin. If using a butterfly needle setup for collection, draw a discard blue-top tube first to remove air from tubing Specimen must be collected with a needle diameter no smaller than a 21 gauge.

Test is offered at a limited number of performing laboratories and may only be collected and performed at testing sites. Send blood specimen to lab as soon as possible after collection.

If also drawing P2Y12 INHIBITOR REACTIVITY (CLOPIDOGREL), VERIFYNOW, specimen needs to be drawn in TWO separate tubes.

Specimen processing instructions:
Do NOT centrifuge. Uncentrifuged whole blood at room temperature required for analysis. Walk specimen to laboratory. 
Transport temperature:
Room temperature.
Specimen stability:
4 hours.
Rejection criteria:
Overfilled tube, underfilled tube, stability limit exceeded, tube system use, sent via courier, centrifugation of whole blood, refrigeration of whole blood, HCT >55%, and other sizes or vendors' 3.2% sodium citrate tubes.

Reference interval:
>= 550 ARU (aspirin reaction units).
Interpretation guide:
>= 550 ARUs indicates no evidence of platelet dysfunction due to Aspirin. <550 ARUs indicates platelet dysfunction consistent with Aspirin effect.
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Aspirin, VerifyNow
Platelet induced aggregation with turbidometric optical detection
Aspirin test, % Inhibition of aspirin
Clinical significance:
Aspirin is used to irreversibly inhibit the platelet enzyme cyclo-oxgenase (COX-1) and block the thromboxane A2 pathway, ultimately preventing platelet aggregation and prolonging patient bleeding. The effect of aspirin lasts while the platelets are in circulation.
Doctoral Director(s:)
Michelle Grant DO    
Review Date: 01/03/2023

Performing Locations

Geisinger Medical Center

Performing laboratory: Coagulation
Technical Lead: Margaret Knowles-Tuchman
Frequency: Daily, all shifts
Performed STAT? Yes

Geisinger Wyoming Valley Medical Center

Performing laboratory: Coagulation
Technical Lead: Jessica Kopeck    
Frequency: Daily, all shifts    
Performed STAT? Yes

Geisinger Community Medical Center

Performing laboratory: Hematology
Technical Lead: Robert Furcon  
Frequency: Daily, all shifts    
Performed STAT? Yes

Geisinger Lewistown Hospital

Performing laboratory: Coagulation
Technical Lead: Melissa Cramer  
Frequency: Daily, all shifts    
Performed STAT? Yes
Locations  |    Search  |    Site Map |   Contact Us
©2000-2024 Geisinger Health System.   All rights reserved.