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Vitamin D is important for strong and healthy bones and can help prevent a number of diseases. Vitamin D levels in your body can be checked with a blood test. Vitamin D deficiency is common in Indian so your doctor might ask for a test if you are at risk, or as part of a general check-up.
What is being tested?
Your skin makes vitamin D when it is exposed to sunlight.You can also get vitamin D from food or supplements. The liver changes the vitamin D from your skin or food into a storage form called 25-hydroxy-vitamin D. It is this form that is usually measured in the vitamin D test. Other forms of vitamin D can also be measured, depending on your specific circumstances.
Why would you need this test?
Your doctor might ask you to have this test if you are at risk of being vitamin D deficient. You might also need it if you have:
1) Abnormal levels of minerals such as calcium, phosphate or magnesium in your blood
2) bone problems
3) Diseases that might result in, or be caused by, too much or too little vitamin D
4) Problems with your parathyroid gland
5) How to prepare for this test
6) No special preparation is required.
Understanding your results
You will need to discuss with your doctor what the results mean for you. Generally, a low level of 25-hydroxy-vitamin D may mean you are not getting enough vitamin D from sunlight or from food. It could also indicate problems with vitamin D absorption from your intestines, or that your liver is not making enough of this type of vitamin D. A high level of vitamin D usually comes from taking too much in, either from pills or in food. Abnormal levels of a type of vitamin D produced in the kidney (1,25-dihydroxy-vitamin D) can be a sign of kidney problems or a range of other conditions.
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