What is a vitamin D test? A vitamin D test measures the levels of vitamin D in your blood. Vitamin D helps your body absorb calcium to build healthy bones and teeth. It also helps keep your muscles, nerves, and immune system working normally. Having vitamin D deficiency (very low levels of vitamin D) can lead to bone disorders and other medical conditions. #best pathology in Moshi #best pathology lab in moshi #best pathology lab near me #best pathology near me #pathology in Moshi #pathology lab in moshi #pathology lab near me #pathology near me #all types of blood test #calcium test #Vitamin D3 test