Test Overview

Test Methodology

High Performance Liquid Chromatography (HPLC)

Test Usage

Monitor therapeutic drug level.

Reference Range*

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.

Test Details

Days Test Performed

=Monday, Thursday

Analytic Time

2 - 7 days

Soft Order Code

MMLR

Test Updated

Update Type: Test Methodology Changed

Updated Date: 05/06/2020

Synonyms

Synonyms

Trimethoprim
Sulfamethoxazole
CO-Trimoxazone
Cotrimoxazole
Septra
Bactrim

+ See More

Laboratory

Sendout

Laboratory Reference

Mayo TMP (80146) Trimethoprim, SFZ (8238) Sulfamethoxazole

Looking to Order a Test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Specimen Requirements

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.

Rejection Criteria

SST tube not acceptable.

Container

Yellow Top Tube
Red Top Tube

Normal Volume

1 mL serum

Minimum Volume

0.5 mL serum

Additional Information

Test sent to Mayo Medical Laboratories.

Billing Information

Fee Codes


CPT Code

80299 x2

Have More Billing Questions?

Explore our helpful billing resources:

Billing Resources


Billing FAQ