The retina is located at the back of the eye and contains light-sensitive cells and nerve cells. These cells are what allow your eyes to receive and organize the information that you see, but they are susceptible to a condition called hypoxia.
Monitor the amount of insulin produced by the beta cells in the pancreas (endogenous); in this case, a C-peptide test may also be done. Insulin and C-peptide are produced by the body at the same rate as part of the conversion of proinsulin to insulin in the pancreas.
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.nsulin levels are most frequently ordered following a low glucose and/or when someone has acute or chronic symptoms of low blood glucose (hypoglycemia) caused by, for example, an insulinoma. Symptoms of hypoglycemia may include: 1  Sweating. 2  Palpitations. 3  Hunger. 4  Confusion. 5  Blurred vision. 6  Dizziness.