Dietary Preparation for 24 Hour Urine Collection

Dietary Preparation for 24 Hour Urine Collection
Dietary Restrictions and Medication Precautions for Specific Tests and Compounds

If testing for:

Catecholamines, Fractionation, Urinary Free (Epinephrine, Free Catecholamine) and Dopamine
Avoid caffeine 4 hours prior to and during collection. Avoid vigorous exercise during urine collection. Mandelamine should be avoided 48 hours prior to and during collection. If you are taking Mandelamine, please consult your doctor before discontinuing medication.

5-HIAA (5-Hydroxyindoleacetic Acid)
Avoid bananas, avocados, plums, eggplant, tomatoes, plantain, pineapples, walnuts, and kiwi for a 72 hour period prior to and during the collection. Avoid smoking and alcohol for 72 hours prior to and during collection. Reserpine, imipramine, isoniazid, methyldopa, monoamine oxidase inhibitors or any compound containing these drugs will affect test results. If you are on any of these medications, please consult your doctor prior to discontinuing.

HVA (Homovanillic Acid)
Avoid disulfiram, reserpine and pyridoxine for 48 hours prior to and during collection. Avoid levodopa for 2 weeks prior to and during collection. If you are on any of these medications, please consult your doctor prior to discontinuing.

Metanephrines, Total
Avoid caffeine 4 hours prior to and during collection. Monoamine oxidase inhibitors affect test results and should be discontinued at least 1 week prior to beginning collection. If you are taking this medication, please consult your physician prior to discontinuing.

Oxalate
Avoid excessive amounts of vitamin C (more than 2 grams/day) or vitamin C-rich foods for 48 hours prior to and during collection.

Porphyrins, Quantitative
Avoid alcohol 24 hours prior to and during collection. Phenazopyridine, oxytetracycline, sulfamethoxazole, acriflavine, ethoxazene, and tetracycline affect test results and should be discontinued 2-4 weeks prior to and during urine collection. If you are on any of these medications, please consult your doctor prior to discontinuing. Store the urine container away from direct sunlight during the entire collection period.

VMA (Vanillylmandelic Acid)
Anti-hypertensive agents (e.g. alpha-methyldopa) affect test results and should be avoided for 48 hours prior to collection. If you are on this type of medication, please consult your doctor prior to discontinuing.

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