Test Directory
Platelet Function Assessment (PFA) Screen
Justification
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 |