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Test Code PFA Platelet Function Assay Screen

Performing Laboratory

Memorial Hospital Laboratory- Automated Procedures  304-388-5953       

Specimen Requirements

Whole Blood- Light Blue Top, Sodium Citrate

Draw 2 full, tubes by “clean” venipuncture (no excessive trauma).

Immediately after draw, invert tubes several times to mix blood with additive.

Transport promptly at ambient temperature only.

Specimen must arrive within 4 hours of collection.

Specimen Rejection

  • Improperly labeled, collected, stored, and transported
  • Quantity not sufficient
  • Hemolyzed
  • Clotted 
  • Decreased hematocrit or platelet count

Storage and Stability

Room Temperature- 4 hours

Reference Values

Platelet Funtion Epinephrine EPI 73-185 seconds
Platelet Function ADP 55-126 seconds

Interpretation

Normal result with both tests indicates no platelet dysfunction.  Prolonged EPI result with normal ADP result is most often due to drug effect (platelet inhibiting drugs including aspirin).  If both results are prolonged, this suggests platelet disorder or von Willenbrands disease. Results should always be evaluated in conjunction with clinical history, clinical presentation and other laboratory findings.

Methodology

Platelet Plug Formation

Days Test Set Up and Turnaround

Monday through Sunday, Continuously

AM Collection Expected by 9AM same day
Routine Expected within 24 hrs
Stat Expected within 1 hr
Timed Expected results are test dependant

CPT Coding

85576 x 2