24 hr urine in 15 mL 50% HCl
Minimum aliquot volume : 30 mL urine
Total 24 hr urine volume must be clearly indicated
High Performance Liquid Chromatography
0 – 1 yr : < 10.7 µmol/mmol creatinine
2 – 4 yrs : < 6.3 µmol/mmol creatinine
5 – 9 yrs : < 4.7 µmol/mmol creatinine
10 – 19 yrs : < 4.7 µmol/mmol creatinine
≥ 20 yrs : < 34.3 µmol/day
Mean = 7 days, Range: 3 – 11 days
Monday – Friday
Instructions before sampling
Patient Preparation:1. Patient should abstain from the following at least 3 days prior to and during urine specimen collection:a) intake of food like bananas, vanilla, chocolate, cofee and tea b) where medically possible, drugs such as drugs containing phenotiazines, gentisic or homogentisic acid which may potentially interfere with the testing.
2. If the patient cannot be completely removed from a drug regime, test result should be interpreted with appropriate clinical judgement based on expected physiology response to these drugs.
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