Urea is the final excretory product of nitrogen (protein) metabolism in the body.
Urea is the final excretory product of nitrogen (protein) metabolism in the body. Urea could be low as a result of inadequate intake of dietary protein, or malabsorption of amino acids. Otherwise inadequate renal clearance or urea cycle dysfunction could be causative factors. In the later case one would expect hyperammonemia and elevated urinary levels of glutamine, asparginine and alanine. Since manganese is a cofactor for arginine-urea hydrolase, low urea could reflect manganese deficiency that could be confirmed by means of elemental analysis of red blood cells.
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1-Methylhistidine, 3-Methylhistidine, Alanine, Alpha-amino-N-butyrate, Alpha-aminoadipate, Ammonia (NH4), Ammonia Level (NH4), Anserine, Arginine, Asparagine, Aspartate, Beta-alanine, Beta-aminoisobutyrate, Carnosine, Citrulline, Creatinine, Cystathionine, Cysteine, Cystine, Ethanolamine, Gamma-aminobutyrate, Glutamate, Glutamine, Glutamine/Glutamate, Glycine, Histidine, Homocystine, Hydroxyproline, Isoleucine, Leucine, Lysine, Methionine, Methionine Sulfoxide, Ornithine, Phenylalanine, Phosphoethanolamine, Phosphoserine, Proline, Sarcosine, Serine, Taurine, Threonine, Tryptophan, Tyrosine, Urea, Valine
