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Platelet Function Assessment (PFA) Screen

Justification

General qualitative platelet function screening test.

STAT: < 24 hours (M-F)

Light Transmittance Aggregometry (LTA)

Draw Tube: Blue Top

Sample Type: Citrated Whole Blood

Specimen Requirements

Sample Type Volume Required Minimum Volume Stability
PREFERRED Citrated Whole Blood Four tubes, 3mL each (or equivalent volume) Two tubes, 3mL each (or equivalent volume) Room Temperature: 4 hours
By appointment only - must arrive at lab within 2 hours of draw
ALTERNATIVE - - - -
REJECTION CRITERIA Samples received more than 2 hours after draw
SPECIAL INSTRUCTIONS See Draw Guide By appointment only

General Information

METHODOLOGY Light Transmittance Aggregometry (LTA)
STAT TAT < 24 hours (M-F)
STAT TAT Performance > 90% of results released in 24 hours
ROUTINE TAT < 24 hours (M-F)
ALTERNATIVE NAMES Platelet Function Assay, Platelet Function Screen, PFA-100 equivalent
DESCRIPTION Includes platelet function screening by light transmission aggregometry in response to ADP and control agonists and von Willebrand Factor Activity screening with ristocetin.
LIMITATIONS Hemolytic, Icteric, and Lipemic samples
NORMAL RANGE Normal
ASSOCIATED TESTING -
REFERENCES -
SAMPLE REPORT Upon request
NEW YORK STATE APPROVED -

Test Codes

ORDER CODE P3356
CPT CODE 85576, 85245
LOINC CODE 5992-3, 6014-5