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HelpTest Code FTP Platelet Function Test
Performing Laboratory
Hunterdon Medical Center
Useful For
Platelet aggregation provides the first line of defense against bleeding. Even with a normal platelet count, the platelets may be dysfunctional due to congenital or acquired conditions. It is recognized that many drugs and compounds (prescription and non-prescription) may affect platelet aggregation. The most common of these is aspirin. It is important to obtain a complete medical history including a list of drugs taken 7-10 days prior to testing.
Inadequate platelet aggregation may lead to bleeding complications. As a result it may be desirable to assess platelet count and platelet aggregation in certain patient populations.
Special Instructions
Platelet Function Test (FTP) will be performed only if the platelet count is above 49 (10*9)/L. Sufficient platelets must be present to yield a functional response.
Specimen Required
To be collected by Laboratory Staff and delivered to the laboratory immediately.
| Two Specimens Required | Volume |
| ADP Tube | 1.0 mL |
| Lavender Top (K₂EDTA) | 1.0 mL |
Specimen Transport Temperature
Ambient
Specimen Type
Blood
Specimen Stability Information
Must be tested within 10 minutes of collection
Reject Due To
- Clotted specimen
- Incorrect volume
- Delay in testing
Day(s) Performed
Monday through Sunday 9AM-3PM
Reference Values
Recommendation for functional platelet counts:
Note: many drugs taken 7-10 days prior to testing may affect platelet function; the most common is aspirin.
| Procedure | Functional Platelets | Units |
| Invasive surgery | >50 | 10*9/L |
| Non-invasive procedure | >20 | 10*9/L |
Method Name
Impedance cell count with ADP agonist.