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List All Test Names Beginning With:
|A B C D E F G H I J K L M N O P Q R S T U V W X Y Z|
|Mnemonic||UMETA and U24H|
|Specimen Requirements||80 mL aliquot of 24 hour urine collection preserved with Sulfamic acid. Refer to charts in Specimen Handling and Additional Information sections.|
If Sulfamic acid is not available, HCl is also an acceptable preservative. See HCl for Urine Preservation.
If test is ordered at the same time as Oxalate, collect with HCl instead of Sulfamic acid. See Oxalate.
Refrigerate during collection.
24 hour urine specimen collection container must have preservative pouch(es) added prior to collection.
Pediatric 24 Hour Urine Acidification:
Testing includes Normetanephrine and Metanephrine
False positive increases in urine and plasma metanephrines and catecholamines have been associated with the following drugs or classes of drugs: anti-depressants, anti-psychotics, some beta blockers, dihydropyridine calcium channel blockers, some anxiolytics, anti-Parkinson’s drugs, decongestants, phenoxybenzamine.
Interpretation of results while on one of these agents should be interpreted with caution and put into clinical context.
24 Hour Urine HVA and VMA have historically been used in the screening of pheochromocytoma and have been replaced by the 24 hour Urine Metanephrine screen, a more specific assay.
|Testing Location||Analytical Toxicology
|Alternate Name(s)||Hypertension Screen, Normetanephrine, Pheochromocytoma Screen|
|Reference Interval||24 hour urine levels less than 2.4 umol/d Metanephrine and less than 5.3 umol/d Normetanephrine may be seen in hypertensive patients.|