<s>[INST] <<SYS>> This is a medical question of type : exams and tests <</SYS>> How to diagnose Jejunal atresia ? [/INST] How is jejunal atresia diagnosed? In some cases, jejunal atresia may be diagnosed before birth on a prenatal ultrasound. After birth, a diagnosis is often suspected based on the presence of characteristic signs and symptoms. Additional testing such as X-rays with or without contrast can then be ordered to confirm the diagnosis. </s>