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Geisinger Medical Laboratories Test Catalog
ASPIRIN, VERIFYNOW |
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ORDERING INFORMATION: |
Geisinger Epic Procedure Code: LAB1788 Geisinger Epic ID: 43808 | |
SPECIMEN COLLECTION |
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Specimen type: |
Whole blood | |
Preferred collection container: |
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Alternate Collection Container: |
Other size blue-top (3.2% sodium citrate) tubes (e.g., 1.8 mL, 4.5 mL)
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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. |
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| SPECIMEN PROCESSING |
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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%. | |
TEST DETAILS |
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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): |
85576 | |
| 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 | |
Methodology: |
Platelet induced aggregation with turbidometric optical detection |
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Synonyms: |
Aspirin test, % Inhibition of aspirin PFASA
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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:) |
Mary Dhesi MD | |
| Review Date: | 01/03/2023 | |
Performing Locations
Geisinger Wyoming Valley Medical Center