High Performance Liquid Chromatography (HPLC)
Monitor therapeutic drug level.
Trimethoprim: >2 mcg/mL; Sulfamethoxazole: 90 - 100 mcg/mL, Toxic > or = 300 mcg/mL.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Days Test Performed
2 - 7 days
Soft Order Code
Update Type: Test Methodology Changed
Updated Date: 05/06/2020
Mayo TMP (80146) Trimethoprim, SFZ (8238) Sulfamethoxazole
Looking to Order a Test?
We’ve provided helpful links to make ordering easy.
All specimens should be accompanied by a requisition.
Learn about how to properly label and where to ship specimens.
MLabs provides all the supplies necessary for the collection of specimens.
Visit our provider FAQ and learn about common questions to ordering tests.
Offsite Collection Instructions
Collect specimen in a red top tube; do not use SST tube. Centrifuge, aliquot serum into a plastic vial, and freeze within 2 hours of collection.
SST tube not acceptable.
1 mL serum
0.5 mL serum
Test sent to Mayo Medical Laboratories.