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Test Code PFAX Platelet Function Assay (PFA), Blood

Important Note

Specimens must NOT be transported through a pneumatic tube system.

 

REGISTRATION:  If drawing an OUTPATIENT, please order a platelet count (PLTCNT) and hematocrit (HCRT) also.

Additional Codes

Hospital Ordering Code
LAB318  PLATELET FUNCTION TEST

Specimen Requirements

Sodium citrate and EDTA whole blood are required unless a CBC is also collected within 24 hours. Please send CBC results and a list of medications patient is taking.

 

Specimens must arrive within 4 hours of draw.

 

Specimen Type: Whole blood, sodium citrate
Container/Tube: 2.7-mL, light blue top (sodium citrate)

(5.4mL total volume needed for testing. Can draw 3 short draw light blue top (sodium citrate) tubes.) 

Specimen Volume: 2 full tubes

Collection Instructions:

1. Tube must be filled to the etched line of the tube - NO SHORT DRAW.

2. Send in original tubes.

3. Hemolyzed specimen is not acceptable.

Additional Information: Label specimens appropriately (sodium citrate whole blood).

 

Specimen Type: Whole blood, EDTA
Container/Tube:  Lavender top (EDTA)

Specimen Volume: 5 mL

Minimum EDTA Volume: 0.5mL

Additional Information: Label specimen appropriately (EDTA whole blood).

Specimen Transport Temperature

Sodium Citrate Whole Blood:

Ambient - 4 hours.  Not acceptable refrigerated or frozen.

 

EDTA Whole Blood (for CBC):

Ambient/Refrigerated - 24 hours.  Not acceptable frozen.

Performing Laboratory

Unity Point-Sioux City-Coagulation

CPT

85576

Methodology

Automated Assay

Rejection Criteria

Reason for not performing test: Testing is not performed due to low hematocrit and/or low platelet counts. The results are invalid for hematocrits below (<) 35% and platelet counts less thean (<) 150,000 on this assay. if concern for a platelet function defect persist consider retesting after normalization of hematocrit and/or platelet count.

Performance

Daily