Trough levels are most reproducible
Centrifuge within 30 minutes of collection. Transfer separated serum or plasma to the "Transfer for Bupropion Analysis" tube containing sodium citrate monobasic (white powder). Mix well. Freeze. Special tube is available in Marshfield Labs Specimen Processing Department. Outreach and Regional Centers please contact Marshfield Labs Customer Service at 800-222-5835 to request "transfer tube for Bupropion analysis". Transfer tubes are ordered and stored by Marshfield Labs Specimen Processing.