what is vitamin d deficiency level?
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The most accurate way to measure how much vitamin D is in your body is the 25-hydroxy vitamin D blood test. A level of 20 nanograms/milliliter to 50 ng/mL is considered adequate for healthy people. A level less than 12 ng/mL indicates vitamin D deficiency.
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Patients should have a 25-OH vitamin D test yearly from September through March, around the same time they get their fasting lipid level. Fasting is not necessary to obtain a vitamin D level; however, getting blood tests at the same time makes sense, reducing the burden of time on the patient.
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Who is at highest risk for Vitamin D deficiency? Older than 65.
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Lack of Vitamin D will lead to poor calcium and phosphate absorption, and problems with muscle strength and balance. There will be a consequent 15-30% increase in PTH secretion, leading to increased bone absorption and osteoporosis risk. Serum calcium and phosphate levels will be normal.
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If you are a woman with low vitamin D levels, taking a supplement of this key vitamin may increase your ability to get pregnant and carry the baby to term. That's why many fertility practices routinely screen for vitamin D levels and give supplements to women who are deficient.
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The Vitamin D Council places the ideal level between 40 and 80 ng/mL with levels below 20 ng/mL as deficient. The Endocrine Society has a Clinical Practice Guideline on the evaluation, treatment, and prevention of vitamin D deficiency.
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The Everlywell Vitamin D Test is an easy way to check your vitamin D level.
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We suggest that all adults who are vitamin D deficient be treated with 50,000 IU of vitamin D3 once a week for eight weeks or its equivalent of 6,000 IU of vitamin D3 daily to achieve a blood level of 25(OH)D above 30 ng/mL, followed by maintenance therapy of 1,500-2,000 IU/day.
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The Bottom Line Regular sun exposure is the most natural way to get enough vitamin D. To maintain healthy blood levels, aim to get 10–30 minutes of midday sunlight, several times per week. People with darker skin may need a little more than this.
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100 IU (2.5 mcg) per day increases vitamin D blood levels 1 ng/ml (2.5 nmol/L). 200 IU (5 mcg) per day increases vitamin D blood levels 2 ng/ml (5 nmol/L). 400 IU (10 mcg) per day increases vitamin D blood levels 4 ng/ml (10 nmol/L). 500 IU (12.5 mcg) per day increases vitamin D blood levels 5 ng/ml (12.5 nmol/L).
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Regular sun exposure is the most natural way to get enough vitamin D. To maintain healthy blood levels, aim to get 10–30 minutes of midday sunlight, several times per week. People with darker skin may need a little more than this.
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Vitamin deficiency is the condition of a long-term lack of a vitamin. When caused by not enough vitamin intake it is classified as a primary deficiency, whereas when due to an underlying disorder such as malabsorption it is called a secondary deficiency.
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Consequently, major risk factors for vitamin D deficiency include inadequate sunlight exposure, inadequate dietary intake of vitamin D-containing foods, and malabsorption syndromes such as Crohn's disease and celiac disease [2].
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For vitamin D deficiency: 50,000 IU per week for 6-12 weeks has been used. However, some patients require higher doses for longer periods of time to maintain optimal blood levels of vitamin D. For preventing osteoporosis: 400-1000 IU/day of vitamin D in a form known as cholecalciferol has been used in older adults.
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A level of 20 nanograms/milliliter to 50 ng/mL is considered adequate for healthy people. A level less than 12 ng/mL indicates vitamin D deficiency.
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Vitamin D deficiency, which classically manifests as bone disease (either rickets or osteomalacia), is characterized by impaired bone mineralization. More recently, the term vitamin D insufficiency has been used to describe low levels of serum 25-hydroxyvitamin D that may be associated with other disease outcomes.
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Make sure not to take more than that without consulting with a health professional. Bottom line: Vitamin D intake is recommended at 400–800 IU/day, or 10–20 micrograms. However, some studies suggest that a higher daily intake of 1000–4000 IU (25–100 micrograms) is needed to maintain optimal blood levels.