how long does it take to check vitamin d levels?
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During a blood test, a health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.
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However, 1,000 to 2,000 IU per day of vitamin D from a supplement is generally safe, should help people achieve an adequate blood level of vitamin D, and may have additional health benefits.
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25-hydroxyvitamin D (25(OH)D) is the major circulating form of vitamin D; thus, the total serum 25(OH)D level is currently considered the best indicator of vitamin D supply to the body from cutaneous synthesis and nutritional intake.
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Another study found that 30 minutes of midday summer sun exposure in Oslo, Norway was equivalent to consuming 10,000–20,000 IU of vitamin D ( 8 ). The commonly recommended daily dose of vitamin D is 600 IU (15 mcg) (3).
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There are two types of tests that might be ordered, but the most common is the 25-hydroxyvitamin D, known as 25(OH)D for short. For the blood test, a technician will use a needle to take blood from a vein. You do not need to fast or otherwise prepare for this type of test.
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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.
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The daily upper limit for vitamin D is 25 mcg to 38 mcg (1,000 to 1,500 IU) for infants; 63 mcg to 75 mcg (2,500 to 3,000 IU) for children 1-8 years; and 100 mcg (4,000 IU) for children 9 years and older, adults, and pregnant and lactating teens and women.
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Your doctor can order a blood test to measure your levels of vitamin D. There are two types of tests that might be ordered, but the most common is the 25-hydroxyvitamin D, known as 25(OH)D for short.
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Your doctor can order a blood test to measure your levels of vitamin D. There are two types of tests that might be ordered, but the most common is the 25-hydroxyvitamin D, known as 25(OH)D for short. For the blood test, a technician will use a needle to take blood from a vein.
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According to most standards, sufficient values for vitamin D are between 30 and 60 ng/mL. For those with chronic conditions like diabetes, autoimmune disease, or cancer, it's not unusual for a provider to target a vitamin D level higher than the typical sufficient range.
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According to the Vitamin D Council, this could be: 15 minutes for a person with light skin. a couple of hours for a person with dark skin.
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Oral vitamin D3 can be taken once a day but also with longer intervals because of its long half life, being around 25 days. It is not known whether equivalent doses once a week or once a month are equally effective.
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The urine test will take 24 hours. The blood test will take a few minutes.
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For most adults, vitamin D deficiency is not a concern. However, some groups — particularly people who are obese, who have dark skin and who are older than age 65 — may have lower levels of vitamin D due to their diets, little sun exposure or other factors.
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But research on the nutrient has gone back and forth, she added. “If you have a significant deficiency, the recommended approach currently is to use 50,000 IU of vitamin D once a week for six to eight weeks, then remeasure levels, to try to boost those values back up a little more quickly,” LaSalle said.
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Most often your doctor will lower the vitamin D dose after six to eight weeks of treatment.
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Vitamin D deficiency is defined if serum hydroxyvitamin D levels are less than 50nmol/L (20 ng/ml), insufficiency as 50-75 nmol/L (20-30 ng/ml). Studies demonstrate that vitamin D is essential also for overall health and well-being.