Blood analysis begins by drawing blood intravenously. It allows us, among other things, to determine blood type. It also helps to quantify the components in the blood like cholesterol levels, to detect anomalies such as anemia and diabetes, to evaluate cardio-vascular risks, or to monitor the functioning of certain organs such as the kidney, thyroid, or liver. Certain blood analyses must be done while fasting like a lipid or glycemic test. The results depend on age and sex, but also on medications being taken.