Cardio IQ® Vitamin D, 25-Hydroxy - This test measures the levels of Vitamin D in your body, which is crucial for bone health. It's especially useful for people without kidney disease. Low levels of Vitamin D can lead to bone issues like rickets in children and osteomalacia in adults, while high levels can cause hypercalcemia. This test specifically looks at two forms of Vitamin D: 25OH D₃ (the type your body makes) and 25OH D₂ (a form used to treat Vitamin D deficiency).