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Test ID NBLD0073 Metanephrines, Fractionated, 24 Hour, Urine

Reporting Name

Metanephrines, Fractionated, 24h, U

Useful For

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

 

Confirming positive plasma metanephrine results

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Urine


Advisory Information


 



Necessary Information


24-Hour volume is required.



Specimen Required


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

Supplies: Urine Tubes, 10 mL (T068)

Container/Tube: Plastic urine tube (T068)

Specimen Volume: 10 mL

Collection Instructions:

1. Collect urine for 24 hours.

2. 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.

Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens in Special Instructions for multiple collections.


Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 7 days
  Frozen  14 days
  Ambient  7 days

Reference Values

METANEPHRINE

Males

Normotensives

3-8 years: 29-92 mcg/24 hours

9-12 years: 59-188 mcg/24 hours

13-17 years: 69-221 mcg/24 hours

≥18 years: 44-261 mcg/24 hours

Reference values have not been established for patients that are <36 months of age.

Hypertensives: <400 mcg/24 hours

Females

Normotensives

3-8 years: 18-144 mcg/24 hours

9-12 years: 43-122 mcg/24 hours

13-17 years: 33-185 mcg/24 hours

≥18 years: 30-180 mcg/24 hours

Reference values have not been established for patients that are <36 months of age.

Hypertensives: <400 mcg/24 hours

 

NORMETANEPHRINE

Males

Normotensives

3-8 years: 34-169 mcg/24 hours

9-12 years: 84-422 mcg/24 hours

13-17 years: 91-456 mcg/24 hours

18-29 years: 103-390 mcg/24 hours

30-39 years: 111-419 mcg/24 hours

40-49 years: 119-451 mcg/24 hours

50-59 years: 128-484 mcg/24 hours

60-69 years: 138-521 mcg/24 hours

≥70 years: 148-560 mcg/24 hours

Reference values have not been established for patients that are <36 months of age.

Hypertensives: <900 mcg/24 hours

Females

Normotensives

3-8 years: 29-145 mcg/24 hours

9-12 years: 55-277 mcg/24 hours

13-17 years: 57-286 mcg/24 hours

18-29 years: 103-390 mcg/24 hours

30-39 years: 111-419 mcg/24 hours

40-49 years: 119-451 mcg/24 hours

50-59 years: 128-484 mcg/24 hours

60-69 years: 138-521 mcg/24 hours

≥70 years: 148-560 mcg/24 hours

Reference values have not been established for patients that are <36 months of age.

Hypertensives: <900 mcg/24 hours

 

TOTAL METANEPHRINE

Males

Normotensives

3-8 years: 47-223 mcg/24 hours

9-12 years: 201-528 mcg/24 hours

13-17 years: 120-603 mcg/24 hours

18-29 years: 190-583 mcg/24 hours

30-39 years: 200-614 mcg/24 hours

40-49 years: 211-646 mcg/24 hours

50-59 years: 222-680 mcg/24 hours

60-69 years: 233-716 mcg/24 hours

≥70 years: 246-753 mcg/24 hours

Reference values have not been established for patients that are <36 months of age.

Hypertensives: <1,300 mcg/24 hours

Females

Normotensives

3-8 years: 57-210 mcg/24 hours

9-12 years: 107-394 mcg/24 hours

13-17 years: 113-414 mcg/24 hours

18-29 years: 142-510 mcg/24 hours

30-39 years: 149-535 mcg/24 hours

40-49 years: 156-561 mcg/24 hours

50-59 years: 164-588 mcg/24 hours

60-69 years: 171-616 mcg/24 hours

≥70 years: 180-646 mcg/24 hours

Reference values have not been established for patients that are <36 months of age.

Hypertensives: <1,300 mcg/24 hours

 

For SI unit Reference Values, see https://www.mayocliniclabs.com/order-tests/si-unit-conversion.html

Day(s) and Time(s) Performed

Monday through Friday; 4 p.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

83835

Analytic Time

3 days (not reported on Sundays)

Reject Due To

Hemolysis

NA

Lipemia

NA

Icterus

NA

Other

NA

Method Name

Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) Stable Isotope Dilution Analysis

Urine Preservative Collection Options

Ambient

No

Refrigerated

Yes

Frozen

Yes

6N HCl

Yes

50% Acetic Acid

Preferred

Na(2)CO(3)

Yes

Toluene

Yes

6N HNO(3)

Yes

Boric Acid

Preferred

Thymol

No