Vitamin D tests, which include immunoassays and liquid chromatography-mass spectrometry LC/MS/MS, measure the level of 25(OH)D, the main form of circulating vitamin D. Optimal levels Vitamin D levels of 30 to 100 ng/mL are considered optimal.
Normal Results. The normal range of 25-hydroxy vitamin D is measured as nanograms per milliliter (ng/mL). Many experts recommend a level between 20 and 40 ng/mL. Others recommend a level between 30 and 50 ng/mL. The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories.
Wskaźnikiem zaopatrzenia organizmu w witaminę D jest stężenie 25-hydroksywitaminy D w surowicy (25-OHD). W badaniu oznacza się nieaktywną biologicznie formę witaminy D, ponieważ poziom 1,25-(OH)2 D może być w normie nawet przy niedoborach witaminy w organizmie. Ile wynosi norma witaminy D3? The normal range of 25-hydroxy vitamin D is measured as nanograms per milliliter (ng/mL). Many experts recommend a level between 20 and 40 ng/mL. Others recommend a level between 30 and 50 ng/mL. The examples above are common measurements for results of these tests.
What to expect. The 25-hydroxy vitamin D test involves providing a blood sample. To take a blood sample, a healthcare provider will first clean the skin on the person's arm. Then they will draw
An intake of no less than 1000 IU (25 mcg) of vitamin D3 (cholecalciferol) per day for all adults may bring at least 50% of the population up to 75 nmol/l. Thus, higher doses of vitamin D are needed to bring most individuals into the desired range.

The Endocrine Society, the National and International Osteoporosis Foundation, and the American Geriatric Society define vitamin D deficiency as the level of 25-hydroxyvitamin (25 OH D) of less than 30 ng/mL. The Endocrine Society recommends a preferred range of 40 to 60 ng/mL.

Function Deficiency Vitamin D sources Toxicity Contacting a doctor Summary For adults, a level of vitamin D in the blood of 20 nanograms per milliliter (ng/mL) or above is generally
At that time, their experts concluded: "Based on all the evidence, at a minimum, we recommend vitamin D levels of 30 ng/mL, and because of the vagaries of some of the assays, to guarantee sufficiency, we recommend between 40 and 60 ng/mL for both children and adults." .
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    • vitamin d 25 oh d3 normal range