Specimen Requirements

Preferred: Plasma-Dark Green Lithium Heparin or Serum- red top

Acceptable: Plasma-Mint Green or Serum-SST gold top

Allow SST or red top to completely clot      

Spin and physically separate plasma/serum from contact with cells as soon as possible

4 mL of plasma/serum (minimum 2 mL)

 Hemolyzed specimens will be rejected

For reliable interpretation of results, collect samples either after the drug's distribution phase or immediately before the next oral dose. To accurately refelct the drug in the myocardium and to evaluate cardiac response it is recommended to collect samples 6 hours after oral dose or 4 hours after intravenous dose.