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Normal range: Normal

Comment: Amino acid concentrations show a significant circardian rhythm with intra – day plasma level variation of 30%. Values are highest in mid-afternoon and lowest in the early morning. A variety of inherited metabolic disorders result in aminoacidemia/aminoaciduria. Typically, the abnormal amino acids concentration exceeds 3-4 times normal, but maybe > 10 times normal

(Sample: Plasma (Lithium heparin) separate immediately, freezed, urine (24 hr