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Metanephrines, 24 hour urine
|Patient Preparation||Patient should avoid tobacco, tea, coffee, for 3 days prior to specimen collection.
It is preferable for the patient to be off medications for 3 days prior to collection.
Common antihypertensives (diuretics, ACE inhibitors, calcium channel blockers, alpha and beta blockers) cause minimal or no interference. Medications which are alpha agonists (Aldomet), alpha blockers (Dibenzyline) should be avoided 18-24 hrs prior to specimen collection.
|Collection Instructions||Obtain container from Specimen Receiving.
Refrigerate container during collection
|Container type||24 hour urine collection container
Click here for Urine Preservative Requirements
|Amount to Collect||Entire 24 hour urine output|
|Sample type||24 hour urine collection|
|Preferred volume||10 mL urine|
|Min. Volume||3 mL urine|
|UCSF Rejection Criteria||Container not refrigerated during collection.|
|Processing notes||Add additional 6N HCl if pH > 3. Refrigerate aliquot. Record the patient's age and the total urine volume on the test request form and the transport vial. Order Quest# 19962X for Metanephrines, 24 hour. urine.
If ordered on a random sample order MOLT and request Quest test #14961X for random urine.
|Units||µg/24 hours (mcg/24 hours)|
|Normal range|| Metanephrine
|Stability||Room temperature 1 week (acidified), refrigerated 8 days, frozen at -20C 1 month|
|Turn around times||Test performed Monday-Friday. Turnaround time: 3-6 days.|
|Additional information||To convert µg/d to nmol/d (SI units) multiply by 5.07 (using MW 197.2).
Creatinine is assayed as a measure of completeness of urine collection. If total creatinine excretion is not within normal limits for the patient's age and sex (see entry for Creatinine) and the patient has normal renal function, the urine collection is probably incomplete and the result is invalid.
|Last Updated||3/24/2013 7:50:58 PM|