<prompt> Answer this question truthfullyWhich laboratory tests are utilized for the diagnosis of Peutz-Jeghers syndrome?  <response>: <reason> The following laboratory tests may be helpful in the diagnosis of Peutz-Jeghers syndrome: Stool:Stool guaiac testBlood:Complete blood count CBC to detect anemia Serum iron, total iron-binding capacity, and serum ferritin to detect iron deficiency anemia 