25-year-old woman was admitted with dizziness and tiredness in the emergency room. She was in poor physical condition, their skin and mucous membranes were pale and she suffered from cerebral palsy and mental retardation. vital signs were stable and there were no signs of hemorrhagic shock. The physical examination was down to a BMI of 15.2 without pathological findings. The patient's mother stated that in recent years there had been no weight loss.
The patient would eat normally and had no gastrointestinal problems. There were no signs of acute or chronic inflammation. How would you proceed? What tests you are missing the diagnosis?