24 hr urine in 15 mL 50% HCl Minimum aliquot volume : 30 mL urine
High Performance Liquid Chromatography
≥20 yrs: 3.5 - 41.0 mmol/day
Mean = 7 days, Range: 3 – 11 days
Monday - Friday
Instructions before sampling:
Patients should abstain from the following at least 3 days prior to and during urine specimen collection:
- intake of food like chocolate, walnuts, avocados, bananas, nuts, plums, pineapples, tomatoes, eggplant and vegetable food and
- where medically possible, drugs such as reserpine, phenacetin, acetanilid, nicotine, chlorphenylalanine, isoniazid, L-Dopa, methyldopa and MAO inhibitors.
Total 24-hour urine volume must be clearly indicated.