| Vanillylmandelic Acid, UrineInterfering Factors - Drugs that may increase VMA levels include ajmaline, chlorpromazine, glucagon, guaifenesin, guanethidine, isoproterenol, methyldopa, nitroglycerin, oxytetracycline, phenazopyridine, phenolsulfonphthalein, prochlorperazine, rauwolfia, reserpine, sulfobromophthalein, and syrosingopine.
- Drugs that may decrease VMA levels include brofaromine, guanethidine, guanfacine, imipramine, isocarboxazid, methyldopa, monoamine oxidase inhibitors, morphine, nialamide (in patients with schizophrenia), and reserpine.
- Stress, hypoglycemia, hyperthyroidism, strenuous exercise, smoking, and drugs can produce elevated catecholamines.
- Recent radioactive scans within 1 wk of the test can interfere with test results.
- Failure to collect all urine and store 24-hr specimen properly will result in a falsely low result.
- Failure to follow dietary restrictions before the procedure may cause the procedure to be canceled or repeated.
Vanillylmandelic Acid, Urine has been found in Davis's Lab & Diagnostic Tests
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