24 hr urine in 15 mL 50% HCl Minimum aliquot volume : 30 mL urine
High Performance Liquid Chromatography
≥20 yrs Metanephrine : 400 - 1500 nmol/day ≥20 yrs Normetanephrine : 600 - 1900 nmol/day For subjects 19 yrs and below, results are expressed as per mmol creatinine (see individual tests)
Mean = 7 days, Range: 3 – 11 days
Monday - Friday
Instructions before sampling:
Patient should abstain from the following at least 2 days prior to and during urine specimen collection: - intake of food like chocolate, coffee, banana, food containing vanilla, citrus fruits and - where medically possible, drugs such as aspirin, a-methyldopa ( Aldomat), buspirone, codeine, isoproterenol, mandelamine and metocloproamide. If the patient cannot be completely removed from a drug regimen, test result should be interpreted with appropriate judgement based on expected physiological response to these drugs. Total 24-hour urine volume must be clearly indicated.