Veripath Test Directory

Description Plavix (clopidogrel) affects platelet function by inhibiting ADP receptors. Testing for Plavix effect includes measuring platelets aggregation in whole blood after stimulating with 10uM ADP. Based on the degree of inhibition of platelet aggregation, effect of Plavix is quantified and reported as adequate, suboptimal or no effect.
Specimen Requirements 
Container Light blue (3.2 % sodium citrate) collection tube and EDTA tube
Specimen Type
Preferred Collection Volume 3mL sodium citrate and 4mL EDTA tube
Minimum Collection Volume 3 mL sodium citrate and 2mL EDTA tube
Collection Instructions When drawing specimens for coagulation testing, always draw a "pilot" tube (7-10ml plain red top tube), completely filled. This removes tissue fluid contamination. Samples should be obtained from peripheral vein whenever possible. If drawn from indwelling catheter, the line should be flushed with 15mL of saline. After irrigation, a "pilot" tube should be drawn and discarded.
Specimen Handling In-house patients, transport specimens by hand at room temperature. Specimen must not be transported by automatic tube station.
Outside clients, follow collection instructions and the steps below:
1. Specimen must remain at room temperature.
2. Specimen must arrive withing 1 hour after collection.
Rejection Criteria Hemolysis, contamination with heparin, clotted, short sample, >4 hours old
Methodology Aggregometry
Reference Range See Intrepretive report.
CPT Code(s) 85576
Department Hemostasis/Coagulation
Contact Information Hemostasis Lab; 214-633-4959 Customer Service: 214-633-0400, Toll Free 1-877-887-8136
Turn Around Time 
Performed Monday - Friday 7am - 3pm
Performed by Hemostasis Lab
Notes 1. Platelet count must be greater than 100,000.
2. Specimen must be accompanied by a "Platelet Aggregation Study History Form". The aggregation report will be delayed until form has been submitted.
Updated/Reviewed 07/25/2016