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You can have Vitamin D deficiency if your diet does not include enough nutrient rich in fat-soluble vitamins or if you have impaired intestinal absorption. Persons who get inadequate sun exposure are also susceptible to Vitamin D deficiency.
Vitamin D deficiency can lead to certain symptoms including a loss of bone density, muscle weakness, high or rising blood pressure, exhaustion, anxiety, depression, decreased endurance, chronic pain, and unexplained infertility.
To measure the levels of Vitamin D in the body, a person can take a 25-hydroxy Vitamin D blood test. A level of 20 nanograms/ milliliter (ng/mL) to 50 nanograms/ millilitre (ng/mL) is considered adequate for healthy adult people. People having less than 20 nanograms/ milliliter (ng/mL) levels of serum Vitamin D are considered having Vitamin D deficiency.