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Test Code TXBU 11-Dehydro-Thromboxane B2, Urine

Reporting Name

11-Dehydro-Thromboxane B2, U

Useful For

Assessing if a patient will derive benefit from aspirin therapy


Determining an individual’s risk of coronary heart disease and stroke


Identifying the effectiveness of antiplatelet therapies

Additional Tests

Test ID Reporting Name Available Separately Always Performed
AACT Creatinine, U No Yes

Testing Algorithm

When 11-dehydro-thromboxane B2 testing is performed, urine creatinine will always be performed at no additional charge.

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type


Specimen Required

Container/Tube: Plastic, 10-mL urine tube (T068)

Specimen Volume: 10 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.

Additional Information: Patient should not have taken nonsteroidal anti-inflammatory drugs within 72 hours or aspirin within 2 weeks prior to collection of a specimen.

Specimen Minimum Volume

5 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 7 days
  Frozen  90 days
  Ambient  7 days

Reference Values

≥18 years: 0-2,211 pg/mg creatinine

Reference values have not been established for patients who are <18 years of age.

Reference intervals apply to patients not taking agents known to influence platelet function (aspirin or other nonsteroidal anti-inflammatory drugs, thienopyridines, etc). Healthy individuals taking aspirin typically have 11-dehydro-thromboxane B2 concentrations below 500 pg/mg creatinine using this method.

Day(s) and Time(s) Performed

Wednesday; 8 a.m.

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
TXBU 11-Dehydro-Thromboxane B2, U In Process


Result ID Test Result Name Result LOINC Value
83335 11-Dehydro-Thromboxane B2, U 49734-7

Method Name

TXBU: Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

AACT: Enzymatic Colorimetric Assay


If not ordering electronically, complete, print, and send a Cardiovascular Test Request Form (T724) with the specimen (