Indicadores
The term "vitamin K" refers to a group of chemically similar fat-soluble compounds called naphthoquinones: vitamin K1 (phytonadione) is found in plants and is the primary source of vitamin K for humans through dietary consumption, vitamin K2 compounds (menaquinones) are made by bacteria in the human gut, and vitamin K3 (menadione) is a water-soluble preparation available for adults only. Vitamin K is necessary for the liver to produce the coagulation factors II, VII, IX, and X, as well as the clotting factors protein C, protein S, and protein Z; vitamin K deficiency can result in deficiencies of these coagulation factors and excess bleeding. An injection of vitamin K is routinely given to newborn infants to prevent vitamin K deficiency bleeding, also known as hemorrhagic disease of the newborn. Vitamin K deficiency is rare in adults but may result from chronic malnutrition or an inability to absorb dietary vitamins.
Pruebas
The determination of the amount of Vitamin K present in a sample.
For professionals
Artículo
Research record from Talanta, 2026-09-01. PMID 42691713.
Indicadores
A measurement of the clotting time of plasma recalcified in the presence of excess tissue thromboplastin; it is a measure of the extrinsic pathway of coagulation. It is used to determine the clotting tendency of blood, in the measure of warfarin dosage, liver damage and vitamin K status. Factors measured are fibrinogen, prothrombin, and factors V, VII, and X.
Pruebas
A clotting test measuring the extrinsic pathway, standardised internationally as INR to monitor vitamin K antagonist therapy and assess bleeding risk.
For professionals
Producto
Immunoassay
Producto
Immunoassay
Artículo
Research record from Se Pu, 2026-03-01. PMID 41814903.
Pruebas
The main circulating form of vitamin D and the standard measure of vitamin D status.
For everyone & professionals
Indicadores
The main circulating vitamin D metabolite — the standard measure of vitamin D status.
Indicadores
A small non-essential amino acid in humans, Alanine is one of the most widely used for protein construction and is involved in the metabolism of tryptophan and vitamin pyridoxine. Alanine is an important source of energy for muscles and central nervous system, strengthens the immune system, helps in the metabolism of sugars and organic acids, and displays a cholesterol-reducing effect in animals. (NCI04)
Pruebas
The determination of the ratio of alpha-tocopherol compared with the total vitamin E in a sample. The measurement may be expressed as a ratio or percentage.
For professionals
