This is requested by clinicians for the following medical conditions:

• Diagnosis and monitoring for treatment of neuroblastoma, intestinal neuroendocrine tumors, celiac disease, cystic fibrosis, and autism spectrum disorder
• Screening of patients with possible inborn error of catecholamine metabolism
• Low levels of 5-HIAA that is link to possible symptoms of constipation, depression, fatigue, insomnia, attention deficit and behavioral disorders.

Patient Preparation

• Limit water intake to 2 liters of water and avoid caffeine before the day of collection
• No intake of citrus fruit, pineapple, grapes and tomato 3 days prior the test
• 3 days prior, stop all non-essential medications such as amino acid supplements, melatonin, 5-HTP, laxatives, and teas.

Method: Liquid Chromatography Tandem Mass Spectrometry
Specimen Volume Requirement: 20ml midstream urine (First Morning)
Turnaround time: Cut off every Tuesday 4PM, release by Friday 12NN
Storage: -20°C Freezer, and ship on ice

 
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