Products - Antigen detection - Bone metabolism - 25-OH vitamin D

25-OH vitamin D

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Disease information

Bone metabolism is primarily determined by the activity of the osteoblasts (cells which make bone) and osteoclasts (cells that resorb bone). These activities in turn are influenced by hormones like Vitamin D, parathyroid hormone and calcitonin.

Vitamin D are a group of structurally related hydrophobic vitamins of which the most important physiologically, are

  • Vitamin D3 from animals
  • And Vitamin D2 from plants and fungi

Vitamin is converted into its active form by a two step hydroxylation process. First step takes place in liver where it is hydroxylated at 25th position to yield 25-OH vitamin D. The next hydroxylation takes place in the kidney at 1st position. This yields 1,25-dihydroxy vitamin D (the active form).

Most of the vitamin D (about 90 percent) is bound to vitamin D binding protein. Another 10 % is bound to albumin. Only about 1 percent of it is free. The free and albumin bound vitamin D are considered biologically active.

Diagnostic Guidelines

Diagnostics are based on the estimation of 25-OH vitamin D levels. This is because this form of vitamin D is responsible for most of the metabolites of vitamin D in the blood despite 1,25-dihydroxy vitamin D being the biologically active form. The levels are adequate predictors of vitamin D status. Vitamin D is deficient in rickets in children and osteomalacia, which are both characterized by decreased bone mineralization.

Combined estimation of levels of vitamin D, parathyroid hormone and calcitonin accurately relay whether bone disorders or diseases are present or not.

25-OH vitamin D products

The individual product regulatory statements may vary, please refer to the instructions for use for more information.

wdt_ID Method Parameter Substrate Species/ Antigen
635 ELISA 25-OH vitamin D antibody-coated
microplate wells
25-OH vitamin D (D2 and D3)
636 ELISA intact PTH antibody-coated
microplate wells
recombinant human parathormone (1-84)
637 ELISA calcitonin antibody-coated
microplate wells
synthetic human calcitonin
Method Parameter Substrate Species/ Antigen
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