Plasma amino acids

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Amino acids

Amino acids - plasma

• Alanine
  • Children: 200 to 450
  • Adults: 230 to 510
• Alpha-aminoadipic acid
  • Children: not measured
  • Adults: not measured
• Alpha-amino-N-butyric acid
  • Children: 8 to 37
  • Adults: 15 to 41
• Arginine
  • Children: 44 to 120
  • Adults: 13 to 64
• Asparagine
  • Children: 15 to 40
  • Adults: 45 to 130
• Aspartic acid
  • Children: 0 to 26
  • Adults: 0 to 6
• Beta-alanine
  • Children: 0 to 49
  • Adults: 0 to 29
• Beta-amino-isobutyric acid
  • Children: not measured
  • Adults: not measured
• Carnosine
  • Children: not measured
  • Adults: not measured
• Citrulline
  • Children: 16 to 32
  • Adults: 16 to 55
• Cystine
  • Children: 19 to 47
  • Adults: 30 to 65
• Glutamic acid
  • Children: 32 to 140
  • Adults: 18 to 98
• Glutamine
  • Children: 420 to 730
  • Adults: 390 to 650
• Glycine
  • Children: 110 to 240
  • Adults: 170 to 330
• Histidine
  • Children: 68 to 120
  • Adults: 26 to 120
• Hydroxyproline
  • Children: 0 to 5
  • Adults: not measured
• Isoleucine
  • Children: 37 to 140
  • Adults: 42 to 100
• Leucine
  • Children: 70 to 170
  • Adults: 66 to 170
• Lysine
  • Children: 120 to 290
  • Adults: 150 to 220
• Methionine
  • Children: 13 to 30
  • Adults: 16 to 30
• 1-methylhistidine
  • Children: not measured
  • Adults: not measured
• 3-methylhistidine
  • Children: 0 to 52
  • Adults: 0 to 64
• Ornithine
  • Children: 44 to 90
  • Adults: 27 to 80
• Phenylalanine
  • Children: 26 to 86
  • Adults: 41 to 68
• Phosphoserine
  • Children: 0 to 12
  • Adults: 0 to 12
• Phosphoethanolamine
  • Children: 0 to 12
  • Adults: 0 to 55
• Proline
  • Children: 130 to 290
  • Adults: 110 to 360
• Serine
  • Children: 93 to 150
  • Adults: 56 to 140
• Taurine
  • Children: 11 to 120
  • Adults: 45 to 130
• Threonine
  • Children: 67 to 150
  • Adults: 92 to 240
• Tyrosine
  • Children: 26 to 110
  • Adults: 45 to 74
• Valine
  • Children: 160 to 350
  • Adults: 150 to 310

Note: all measurements in micro mole per liter (micro mol/L). The normal range of values may vary between different laboratories, and the laboratory performing the test should therefore be consulted in interpretation of the test result.

An elevated level of a particular amino acid is highly suggestive of an inherited defect in metabolism of that amino acid. The test for an individual amino acid may also be used for following the effectiveness of a particular treatment.

If the total amino acid level is elevated, several diseases or conditions may be the cause:

• Chronic renal failure
• Acute renal failure
• Eclampsia
• Fructose intolerance
• Reye syndrome
• Ketoacidosis (from diabetes )

If the total amino level is decreased, the following conditions may be responsible:

• Fever
• Malnutrition
• Rheumatoid arthritis
• Hartnup disease
• Huntington's chorea
• Phlebotomus fever
• Nephrotic syndrome
• Adrenal cortical hyperfunction

Review Date: 04/29/2005
Reviewed By: Frank A. Greco, M.D., Ph.D., Director, Biophysical Laborartory, The Lahey Clinic, Burlington, MA. Review provided by VeriMed Healthcare Network.