| Sample type | 24 hr urine (acidified) |
| Container | 24 hr urine container with 50 mL hydrochloric acid |
| Precautions |
Elevated by dietary walnuts, bananas, tomatoes, avocado, kiwi fruit, pineapple, plantain, plums, pecan nuts. Avoid for 3-4 days prior to starting urine collection. Click here for patient information sheet for urine collection |
| Minimum volume | 2 mL |
| Reference range | ≤ 42 μmol/24 h |
| Turnaround time | 14 days |
| Method | Liquid chromatography-tandem mass spectrometry |
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