INSULIN
Insulin testing has several possible uses. Insulin is a hormone that is produced and stored in the beta cells of the pancreas. Insulin helps transport glucose , the body's main source of energy, from the blood to within cells. If a person makes too little insulin or is resistant to its effects, cells starve. If someone makes too much, as may happen with an insulin-producing tumor (insulinoma) for example, then symptoms of low blood glucose (hypoglycemia) emerge.
