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Frequently Asked Questions

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Have questions about laboratory testing? We're here to help you understand your tests and what results might mean for you.
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Vanillylmandelic Acid (VMA)

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Vanillylmandelic acid (VMA) is one of the breakdown products (metabolites) of epinephrine (adrenaline) and norepinephrine. The VMA test primarily detects or rules out tumors called neuroblastomas in children.
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Food Allergy Testing

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Wondering how food allergies are diagnosed? Learn about how food allergies are different from intolerances and the tests that can help identify food allergies.
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Food Sensitivity Test

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Does a certain food not sit well with you? Learn the basics about food sensitivities and intolerances and what kinds of tests are available to identify them.
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Gastrin

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Gastrin is a hormone that regulates the production of acid in the stomach during the digestive process. The gastrin test helps diagnose tumors called gastrinomas, Zollinger-Ellison (ZE) syndrome, and hyperplasia of G-cells.
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Editorial Policy

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The mission of Testing.com is to provide a comprehensive, accurate, dynamic, and up-to-date website to inform the public about laboratory testing. The scientific content is developed and updated in accordance with established editorial policies.
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Therapeutic Drug Monitoring

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Therapeutic drug monitoring is the measurement of drugs levels in the blood at timed intervals to maintain relatively constant levels and avoid toxicity.
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Pubic Lice Test

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Pubic lice are parasitic insects that live and typically reproduce in pubic hair. Learn more about the symptoms of pubic lice and how to get tested.
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Lithium Testing

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Lithium tests are an important tool that doctors use to guide and monitor lithium treatment in people living with bipolar disorder and other conditions.
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