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Test ID 3MT1 3-Methoxytyramine, 24 Hour, Urine


Necessary Information


24-Hour volume is required.



Specimen Required


Only orderable as part of a profile. For more information see META3 / Metanephrines with 3-Methoxytyramine, 24 Hour, Urine.

 

Patient Preparation: Tricyclic antidepressants, labetalol, and sotalol medications may elevate levels of catecholamines producing results that cannot be interpreted. If clinically feasible, it is optimal to discontinue these medications at least 1 week before collection. Levodopa (Sinemet) medication will cause false-positive results. For advice on assessing the risk of removing patients from these medications and alternatives, consider consultation with a specialist in endocrinology or hypertension.

Supplies: Urine Tubes, 10 mL (T068)

Submission Container/Tube: Plastic urine tube

Specimen Volume: 10 mL

Collection Instructions:

1. Complete 24-hour urine collections are preferred, especially for patients with episodic hypertension; ideally the collection should begin at the onset of a "spell."

2. Collect urine for 24 hours.

3. Add 10 g (pediatric: 3 g) of boric acid or 25 mL (pediatric: 15 mL) of 50% acetic acid as preservative at start of collection.


Useful For

A first- and second-tier screening test for the presumptive diagnosis of catecholamine-secreting pheochromocytomas and paragangliomas

Method Name

Only orderable as part of a profile. For more information see META3 / Metanephrines with 3-Methoxytyramine, 24 Hour, Urine.

 

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

Reporting Name

3-Methoxytyramine, U

Specimen Type

Urine

Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 28 days
  Frozen  90 days
  Ambient  28 days

Reference Values

Only orderable as part of a profile. For more information see META3 / Metanephrines with 3-Methoxytyramine, 24 Hour, Urine.

 

Males: ≤306 mcg/24 hours

Females: ≤242 mcg/24 hours

Day(s) and Time(s) Performed

Monday through Friday; 4 p.m.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

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

82542

LOINC Code Information

Test ID Test Order Name Order LOINC Value
3MT1 3-Methoxytyramine, U 32618-1

 

Result ID Test Result Name Result LOINC Value
609422 3-Methoxytyramine, U 32618-1

NY State Approved

Yes