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Determinations for urinary calcium, steroids, and vanillylmandelic acid (VMA) are best preserved with an acid pH of 3 or less, while testing for porphyrins, urobilinogen, and uric acid requires an alkaline environment.
Serum hydrocortisone, serum catecholamine and urine vanillylmandelic acid levels were normal.
7 jg/24 h, normal: up to 444) and vanillylmandelic acid (7.
Laboratory studies show high urinary levels of vanillylmandelic acid.
Laboratory values were significant for an elevated urine homovanillic acid (HVA)/creatinine ratio of 361, and a normal urine vanillylmandelic acid (VMA)/creatinine ratio.
Urine samples for homovanillic acid (HVA) and vanillylmandelic acid (VNIA) analysis are acidified to pH 2-4 to maintain analyte stability.
Urinary vanillylmandelic acid and catecholamines were within normal limits.
Tumor biomarkers, such as serum chromogranin A, 24-hour urine total metanephrines and 24-hour urine vanillylmandelic acid, correlated with reduction in target lesion size.