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vanillin mandelic acid in the 24-hour urine

Name vanillin mandelic acid in the 24-hour urine
Specimen requirements 10 ml of 24-hour urine
Collection instructions Indicate 24-hour quantity.
Clinical utility suspicions of phaeochromocytoma, neuroblastoma, ganglioneurinoma
Methodology HPLC (high-performance liquid chromatography)
Reference ranges < 33 µmol / 24 h,
The values are highly age-dependent