| Test Name: | Platelet Function Test |
| Epic Order Code: | LAB318 |
| CPT Code: | 85576 | | |
| Specimen(s) Type: | Whole Blood; 2 full tubes required. |
| Acceptable Container(s): | 2 X  Top is light blue. |
| Testing Schedule: | 24 hours day/7 days a week. Notify lab at (601) 984-2367 that PFA is being collected and give name of patient. |
| Turn Around Time: | STAT: 1 hour |
| | Routine: 2 hours |
| Collection Information: | No special patient preparation required. Obtain specimen by standard collection procedures, using a 21 gauge or larger needle. If only Platelet Function is being collected, draw 5 mL into a red top tube, discard and then collect tubes for Platelet Function. Excessive agitation of the sample may effect results. Tube must be full. |
| Transport Information: | Deliver to lab immediately to ensure platelet viability. All specimens must be signed into the laboratory. |
| Reference Clients: | If unable to deliver to the lab immediately, store and transport specimen at room temperature. Specimen must be received and tested within 3 hours. Do not freeze, refrigerate or transport on ice. |
| Causes for Rejection: | Improperly labeled, incorrect container, contaminated, insufficient quantity, incorrect/delay in transport. |
| Reference Range: | Collagen-Epinephrine: 67 - 206 sec. closure time |
| | Collagen-ADP: 47 - 132 sec. closure time |
| Additional Information: | Numerous drugs effect platelet function. Samples with closure times within the specified reference range have adequate or normal platelet function. Samples with normal Coll-ADP results but elevated Coll-Epi most probably demonstrate a medication effect. Samples abnormal for both Coll-Epi and Collagen-ADP suggest an unspecified platelet abnormality. Additional platelet function testing may be required if clinically indicated. Patients with low hematocrits and low platelet counts may give abnormal results. Platelet count <100,000cm and HCT <25% may not give results. |