Vitamin D and B12 PanelBrief Description: The Vitamin D and B12 Panel test is a diagnostic tool that measures the levels of vitamin D and B12 in the blood. Both of these vitamins play critical roles in various physiological functions, and deficiencies can lead to a range of health complications. Vitamin D is primarily associated with bone health and calcium absorption, while vitamin B12 is essential for nerve function, DNA synthesis, and the formation of red blood cells.