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What is the difference between the urine amino acid and the plasma amino acid test?

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What is the difference between the urine amino acid and the plasma amino acid test?

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Plasma levels of amino acids reveal more information regarding long-term nutritional status. Plasma analysis is the preferred way to assess essential amino acid status as it allows a direct look at the supply line from tissue stores. Also, by using plasma to assess amino acid status, you avoid potential errors in reading volumes that exist with urine collection. Urine amino acid assessments aid in the detection of metabolic disorders due to genetic polymorphisms, micronutrient deficiencies or toxic abnormalities, all of which can interfer with amino acid utilization. Urine is more influenced by recent dietary intake and is not a good indicator of long term status.

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