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Verify Now Aspirin

Test Codes

EPIC: LAB3325

Department

Coagulation

Instructions

This test is available only to patients drawn on the Dearborn or Royal Oak Hospital campuses.

Specimen Collection Criteria

Collect: Two Greiner Light Blue-top 3.2% Sodium Citrate tubes.

• TUBES MUST BE FILLED TO THE BLACK LINE (1/2 tube).
• Venipuncture should be performed using a 21G or larger needle (20G or 19G). Use of a butterfly collection device is not recommended.
• First collect a clearing tube (at least 2mL) making sure the clearing tube does not contain any platelet inhibiting substances (e.g., EDTA).
  o Clearing tube does not need to be sent to the lab.
• Tubes must be HAND-DELIVERED to the Coagulation Laboratory immediately. DO NOT send through the pneumatic tube system.

Preparation for Courier Transport

Transport: Whole blood at room temperature (20-26°C or 68-78.8°F).

Rejection Criteria

• Specimens collected in BD light blue top 3.2% Sodium Citrate tubes.
• Specimens collected in Serum Separator (SST) or Heparin tubes.
• Specimens collected at sites other than Dearborn or Royal Oak Hospital campuses.
• Glass tubes and 3.8% Sodium Citrate tubes.
• Specimens that are clotted or grossly hemolyzed.
• Inappropriate specimen volume.
• Specimens received in the Laboratory more than 4 hours past the time of collection.

Inpatient Specimen Preparation

Hand-deliver specimens to the Laboratory immediately after collection. DO NOT use the pneumatic tube system.

In-Lab Processing

Do not refrigerate or freeze specimens. Do not centrifuge. Specimens must be analyzed within 4 hours of collection.

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 4 hours
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): Unacceptable

Specimen Storage in Department Prior to Disposal:

Room Temperature (20-26 C or 68-78.8 F): 5 days
Refrigerated (2-8°C or 36-46°F): 5 days

Laboratory

Dearborn Hematology Laboratory
Royal Oak Coagulation Laboratory

Performed

Sunday – Saturday, 24 hours a day.
Results available within 4 hours of receipt in the Laboratory.

Reference Range

Verify Now Aspirin assay results are reported in Aspirin Reactivity Units (ARU).

ARU values below 550 are indicative of effective aspirin inhibition of platelet activity.

ARU values of 550 or above are indicative of ineffective aspirin inhibition of platelet activity.

Test Methodology

Point of care, utilizing platelet induced aggregation turbimetric optical detection.

Interpretation

Limitations:

NSAID’s will interfere with this assay. Direct IIb/IIIa inhibitors will interfere and testing must not be performed within 48 hours after administration of eptifibatide (integrilin) or tirofibrin (Aggrastat), or within 14 days after administration of abciximab (ReoPro).

CPT Codes

85576

LOINC: 49011-0

Contacts

Last Updated

6/3/2024