Vitamin D (25- hydroxycholecalciferol)

Vitamin D (25-Hydroxycholecalciferol) is the most reliable marker for assessing vitamin D status in the body. This test measures the total circulating form of vitamin D, reflecting both dietary intake and vitamin D produced through sunlight exposure. Adequate vitamin D levels are essential for calcium and phosphorus absorption, bone mineralization, muscle function, and immune health. Deficiency can lead to rickets in children, osteomalacia and osteoporosis in adults, muscle weakness, fatigue, and increased fracture risk. The test is commonly recommended for individuals with bone pain, frequent fractures, limited sun exposure, malabsorption disorders, or chronic kidney disease.