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Indicators
A non-essential amino acid. In hepatocytes, L-citrulline is synthesized in the urea cycle by the addition of carbon dioxide and ammonia to ornithine. L-citrulline is converted into L-arginine by the enzymes argininosuccinate synthetase and argininosuccinate lyase in the presence of L-aspartate and ATP. Subsequently, L-arginine is converted to nitric oxide by nitric oxide synthase and L-citrulline is regenerated as a by-product.
Tests
The determination of the ratio of a sub-population of classical monocytes to all leukocytes that are not T-cells, B-cells, or natural killer cells, present in a sample. The measurement may be expressed as a ratio or percentage.
Tests
The determination of the ratio of the classical monocytes to all leukocytes that are not T-cells, B-cells, or natural killer cells, present in a sample. The measurement may be expressed as a ratio or percentage.
Article
Research record from BMC Infect Dis, 2026-04-04. PMID 41935328.
Article
Research record from Mol Oncol, 2026-05-05. PMID 42087419.
Tests
The determination of the ratio of columnar epithelial cells compared to non-squamous epithelial cells present in a sample. The measurement may be expressed as a ratio or percentage.
Article
Research record from BMJ Open Respir Res, 2026-03-27. PMID 41895789.
Article
Research record from J Chromatogr A, 2026-05-27. PMID 42229279.
Indicators
A non-essential sulfur-containing amino acid in humans, related to cystine, Cysteine is important for protein synthesis, detoxification, and diverse metabolic functions. Found in beta-keratin, the main protein in nails, skin, and hair, Cysteine is important in collagen production, as well as skin elasticity and texture. Also required in the manufacture of amino acid taurine, Cysteine is a component of the antioxidant glutathione, and plays a role in the metabolism of essential biochemicals such as coenzyme A, heparin, and biotin. (NCI04)
Tests
A fibrin degradation product used mainly to help rule out venous thromboembolism when clinical probability is low.
Tests
The determination of the ratio of dendritic cells to leukocytes that are not T cells, B cells or natural killer cells present in a sample. The measurement may be expressed as a ratio or percentage.
Article
Research record from Sci Rep, 2026-06-01. PMID 42225882.
