Which of the following is not used in diagonosis of insulinoma: (A) 72 hows fasting blood glucose levels, (B) C peptide levels, (C) Insulin/glucose ratio, (D) D-xylose test
Answer is D. These blood tests are needed to diagnose insulinoma: glucose insulin C-peptide If available, a proinsulin level might be useful, as well. Other blood tests may help rule out other conditions which can cause hypoglycemia Ref Davidson edition23rd pg837