The 25-hydroxy vitamin D test is the best way to monitor vitamin D levels. The amount of 25-hydroxyvitamin D in your blood is a good indication of how much vitamin D your body has. The test can...

https://www.healthline.com/health/25-hydroxy-vitamin-d-test


Vitamin D is essential for many bodily processes, particularly the development of healthy bones. A 25-hydroxy vitamin D test can reveal whether the vitamin D levels in a person’s blood are within a...

https://www.medicalnewstoday.com/articles/vitamin-d-25-hydroxy


25 hydroxy vitamin D2 (ergocalciferol) is the vitamin D that you have absorbed from foods fortified with plant vitamin D or from an ergocalciferol supplement. The two hormones (ergo- and cholecalciferol) work similarly in the body. The important value is the total 25 hydroxy vitamin D level in your blood.

https://www.mountsinai.org/health-library/tests/25-hydroxy-vitamin-d-test


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 ...

https://www.webmd.com/diet/guide/vitamin-d-deficiency


Lower than normal 25-OH vitamin D levels can result from a dietary deficiency, poor absorption of the vitamin or impaired metabolism of the sterol in the liver. A 25-OH vitamin D deficiency can lead to bone diseases such as rickets and osteomalacia. Above normal levels can lead to hypercalcemia

https://testdirectory.questdiagnostics.com/test/test-detail/17306/vitamin-d-25-hydroxy-total-immunoassay?cc=MASTER


Normal vitamin D levels in the blood are 20 ng/ml or above for adults. People aged 1–70 years should aim to get at least 15 mcg or 600 IU of vitamin D per day. Those who are older or at risk for a...

https://www.medicalnewstoday.com/articles/normal-vitamin-d-levels


The vitamin D metabolite 1,25-dihydroxyvitamin D maintains calcium homeostasis between blood, cells and bones by stimulating calcium absorption from the intestines, reabsorption in the kidneys, and resorption in bones. 1,25(OH)2D up-regulates vitamin D receptors (VDR) in the small intestine, which then transcribes genes that shuttle calcium and ...

https://www.health.harvard.edu/blog/vitamin-d-whats-right-level-2016121910893


Vitamin D supplements are used to treat adults with severe vitamin D deficiency, resulting in loss of bone mineral content, bone pain, muscle weakness and soft bones (osteomalacia). Osteoporosis. Studies suggest that people who get enough vitamin D and calcium in their diets can slow bone mineral loss, help prevent osteoporosis and reduce bone ...

https://www.mayoclinic.org/drugs-supplements-vitamin-d/art-20363792


Cholecalciferol is vitamin D3. Vitamin D helps your body absorb calcium. Cholecalciferol is used as a dietary supplement in people who do not get enough vitamin D in their diets to maintain adequate health. Cholecalciferol may also be used for purposes not listed in this medication guide.

https://www.drugs.com/mtm/vitamin-d3.html


The Vitamin D, 1,25 Dihydroxy level does not have a major change until normal Vitamin D levels, or 25 (OH)D, drops to levels that are considered a VERY severe Vitamin D deficiency. 1,25 dihydroxy-vitamin D or 1.25 Dihydroxy level or 1,25 (OH) (2)D has the normal values are usually listed as 20-76 pg/ml.

https://www.glutathionediseasecure.com/normal-vitamin-d-levels.html


The liver converts the vitamin D you get from the sun, your food or supplements into 25-hydroxyvitamin D, and its concentration in your blood is the most accurate indicator of vitamin D status. Low levels of vitamin D, which result in symptoms affecting your bones and muscles, may also be linked to various chronic diseases. Muscle and Bone Pain

https://healthfully.com/314587-signs-symptoms-of-low-25-hydroxy-vitamin-d-levels.html


In medicine, a 25-hydroxy vitamin D (calcifediol) blood test is used to determine how much vitamin D is in the body. The blood concentration of calcifediol is considered the best indicator of vitamin D status.

https://en.wikipedia.org/wiki/Calcifediol


The liver metabolizes vitamin D2 into 25-hydroxyvitamin D2 and vitamin D3 into 25-hydroxyvitamin D3. These two compounds are collectively known as calcifediol. Calcifediol is the main circulating...

https://www.healthline.com/nutrition/vitamin-d2-vs-d3


This is the storage form of vitamin D, which is converted by the kidneys to the biologically active form, 1,25-dihydroxycholecalciferol. Vitamin D3 is involved in numerous biological processes such as immune system modulation, insulin sensitivity, hormone and neurotransmitter homeostasis, and is essential for ensuring calcium absorption in the ...

https://www.zrtlab.com/blog/archive/vitamin-d-reference-ranges-optimal/


In a study of more than 2,000 mothers-to-be, women with higher levels of 25-hydroxy vitamin D (an indicator of our bodies' vitamin D stores, measurable with a blood test) had a lower risk of ...

https://www.health.com/mind-body/vitamin-d-health-risks


Choosing Wisely: Don’t routinely measure 1,25-dihydroxyvitamin D unless the patient has hypercalcemia or decreased kidney function.

https://www.aafp.org/afp/recommendations/viewRecommendation.htm?recommendationId=140


Vitamin D25 is a shortened name for 25-hydroxy- vitamin D, one of two types of vitamin D that can be measured using a blood test. When a doctor orders a blood test, vitamin D25 will be analyzed, and sometimes the second form of vitamin D, called 1,25D-dyhydroxy-vitamin D (D1,25), will be assessed as well.

https://www.wisegeek.com/what-is-vitamin-d25.htm


Ergocalciferol is vitamin D2. Vitamin D helps your body absorb calcium. Ergocalciferol is used to treat hypoparathyroidism (decreased functioning of the parathyroid glands). Ergocalciferol is also used to treat rickets (softening of the bones caused by vitamin D deficiency) or low levels of phosphate in the blood (hypophosphatemia).

https://www.drugs.com/mtm/vitamin-d2.html


Vitamin D3, 100 Softgels, Vitamin D 1000 IU (25 mcg) Helps Support Immune Health, Strong Bones and Teeth, & Muscle Function, 125% of the Daily Value for Vitamin D in Only One Daily Softgel 4.8 out of 5 stars 1,877

https://www.amazon.com/Nature-Made-Vitamin-1000-Softgels/dp/B004U3Y8OM


Vitamin D3 1000 IU (25 mcg) Tablets Vitamin D3 helps to raise and maintain the vitamin D levels in your body, which helps support your bones, muscles and immune system.† And yes, that's all a very good thing.

https://www.naturemade.com/products/vitamin-d3-25-mcg-1000-iu-tablets


In adults, vitamin D deficiency is defined as a serum 25-hydroxyvitamin D level of less than 20 ng per mL (50 nmol per L), and insufficiency is defined as a serum 25-hydroxyvitamin D level of 20 ...

https://www.aafp.org/afp/2009/1015/p841.html


Product Title Nature Made Vitamin D3, 350 Tablets, Vitamin D 1000 IU (25 mcg) Helps Support Immune Health, Strong Bones and Teeth, & Muscle Function, 125% of the Daily Value for Vitamin D in Only One Daily Tablet. Average Rating: (4.8) out of 5 stars 186 ratings, based on 186 reviews.

https://www.walmart.com/browse/health/vitamin-d/976760_1005863_1001553_8172992


Animal-based foods typically provide some vitamin D in the form of 25 (OH)D in addition to vitamin D 3. The impact of this form on vitamin D status is an emerging area of research. Studies show that 25 (OH)D appears to be approximately five times more potent than the parent vitamin for raising serum 25 (OH)D concentrations [ 17, 20, 21 ].

https://ods.od.nih.gov/factsheets/Vitamin%20D-HealthProfessional/


Test Code: 17306 Methodology: Immunoassay (IA) Clinical Significance: Measurement of serum 25-OH vitamin D concentrations provide a good index of circulating vitamin D activity in patients not suffering from renal disease.Lower than normal 25-OH vitamin D levels can result from a dietary deficiency, poor absorption of the vitamin or impaired metabolism of the sterol in the liver.

https://www.dlolab.com/vitamin-d-25-oh-total-ia


Uses. Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium ...

https://www.webmd.com/drugs/2/drug-8604/ergocalciferol-vitamin-d2-oral/details


The two major vitamins in this group are vitamin D2 and vitamin D3. Vitamin D2 is produced by plants, while vitamin D3 is made in the epidermis when the skin is exposed to sunlight.That's why it's ...

https://www.msn.com/en-us/health/nutrition/is-vitamin-d-the-same-as-vitamin-d3-a-doctor-breaks-it-down/ar-BB15Wkex


In fact, it’s estimated that vitamin D insufficiency affects 25 to 50 percent of the population. 1 That’s pretty alarming. Vitamin D plays an essential role in many of your body’s systems. For that reason, it’s absolutely imperative that you understand the risks and signs of vitamin D deficiency, so you can live a full, healthy life.

https://gundrymd.com/vitamin-d-deficiency-symptoms/


The Vitamin D 25-hydroxy blood test is considered to be the most accurate method of determining how much of this vitamin is within the body. When it is in the kidneys, it is converted into an active vitamin that helps to control calcium and phosphate levels. It is only ordered when there is a suspicion …

https://healthresearchfunding.org/vitamin-d-25-hydroxy-blood-test-results-explained/


Lower than normal 25-OH vitamin D levels can result from a dietary deficiency, poor absorption of the vitamin or impaired metabolism of the sterol in the liver. A 25-OH vitamin D deficiency can lead to bone diseases such as rickets and osteomalacia. Above normal levels can lead to hypercalcemia.

https://testdirectory.questdiagnostics.com/test/test-detail/92888/questassured-25-hydroxyvitamin-d-d2-d3?cc=MASTER


Vitamin D deficiency — when the level of vitamin D in your body is too low — can cause your bones to become thin, brittle or misshapen. Vitamin D also appears to play a role in insulin production and immune function — and how this relates to chronic disease prevention and cancer — but this is still being investigated.

https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/vitamin-d-deficiency/faq-20058397


The metabolically active form of vitamin D, 1,25-di-hydroxy vitamin D, which has a short life, is then synthesized in the kidney as needed from circulating 25-hydroxy vitamin D. The reference interval of greater than 30 ng/mL is a target value established by the Endocrine Society. 2.

https://www.labcorp.com/tests/504115/25-hydroxy-vitamin-d-d-sub-2-sub-d-sub-3-sub-fractionated-lc-ms-ms


Vitamin D is biologically inert and must undergo two successive hydroxylations in the liver and kidney to become the biologically active 1,25-dihydroxyvitamin D. It is commonly agreed that vitamin D (25-OH) is the metabolite to determine the overall vitamin D status as it is the major storage form of vitamin D in the human body.

https://www.medical-diagnosis.net/exam/all-tests/vitamins-minerals/vitamin-d-25-oh/


Vitamin D 50,000 IU = 1,250 mcg (1.25 mg) So, the specific answer to your question, "400 units of Vitamin D is how many micrograms?", the answer is 10 mcg. If you need assistance converting between IU and mcg, you can use our Vitamin D Conversion Tool that will convert between all 3 forms (IU, mcg, mg).

https://walrus.com/questions/converting-units-iu-of-vitamin-d-to-micrograms-mcg


Vitamin D3 1000 IU (25 mcg) Softgels Vitamin D3 helps to raise and maintain the vitamin D levels in your body, which helps support your bones, muscles and immune system. † And yes, that's all a very good thing.

https://www.naturemade.com/products/vitamin-d3-25-mcg-1000-iu-softgels


The Vitamin D 25-Hydroxy Blood Test is the recommended test for those purposes. In some cases, the Vitamin D 1,25 Dihydroxy Blood Test is ordered if an abnormality associated with the enzyme that converts 25-hydroxyvitamin D to 1,25-dihydroxyvitamin D or kidney disease is suspected. Low levels may be indicative of the latter, as this is often ...

https://www.walkinlab.com/products/view/vitamin-d1-25-dihydroxy-blood-test


Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and many other biological effects. In humans, the most important compounds in this group are vitamin D 3 (also known as cholecalciferol) and vitamin D 2 (ergocalciferol).. The major natural source of the vitamin is synthesis of cholecalciferol in the lower ...

https://en.wikipedia.org/wiki/Vitamin_D


Question 3. What test should be used for determining a patient’s vitamin D status? The appropriate test is the serum 25-hydroxyvitamin D [25(OH)D] test. Although 1,25(OH) 2 D is the active metabolite of vitamin D, serum levels of 1,25(OH) 2 D do not reflect the body’s stores and are not useful for determining vitamin D status. Question 4.

https://education.questdiagnostics.com/faq/25-OHVitaminD


Vitamin D is a family of compounds that is essential for the proper growth and formation of teeth and bones. This test measures the level of vitamin D in the blood. Two forms of vitamin D can be measured in the blood, 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D.

https://www.labcorp.com/help/patient-test-info/vitamin-d-tests


25-OHD 3 indicates both endogenous production and supplementation. 25-OHD 2 is an indicator of exogenous sources, such as diet or supplementation. Therapy is based on measurement of Total 25-OHD, with levels <20 ng/mL indicative of Vitamin D deficiency, while levels between 20 ng/mL and 30 ng/mL suggest insufficiency.

https://www.saveonlabs.com/Vitamin-D-25-OH-p/17306.htm