2 - 7 days
Collect specimen in a red top tube; do not use SST tube. Centrifuge, aliquot serum into a plastic vial and freeze. For maximum clinical significance, collect a Peak specimen within 15 minutes after the end of an I.V. infusion or 90 minutes after oral intake.
Collect blood in a red top tube. Spin and aliquot into a screw capped plastic tube. Freeze and send to Specimen Processing. Have ordering provider fully list: drug dose amount, frequency, method, and date and time of last dose prior to draw.
Test sent to Mayo Medical Laboratories; performed by National Jewish Health.