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Sulfamethoxazole, Serum

Reporting Name

Sulfamethoxazole, S
Seattle Children's Hospital Note:

Clinical System Name: Miscellaneous Test

Useful For

Monitoring therapy to ensure drug absorption, clearance, or compliance

Specimen Required

Collection Container/Tube: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions: 

1. Serum for a peak level should be drawn 60 minutes after dose.

2. Spin down within 2 hours of draw.

Specimen Type

Serum Red

Specimen Minimum Volume

0.2 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Red Refrigerated (preferred) 28 days
  Ambient  28 days
  Frozen  28 days

Day(s) and Time(s) Performed

Monday, Thursday; 1 p.m.

Performing Laboratory

Mayo Medical Laboratories in Rochester

Method Name

High-Performance Liquid Chromatography (HPLC)

Method Description

Acetonitrile precipitation with analysis by HPLC.(Unpublished Mayo method)

Reference Values

>50 mcg/mL

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
SFZ Sulfamethoxazole, S 10342-4


Result ID Test Result Name Result LOINC Value
8238 Sulfamethoxazole, S 10342-4

Reject Due To


Mild OK; Gross OK


Mild OK; Gross OK


Mild OK; Gross OK


Serum gel tube