Investigation of choice to diagnose hyperophic pyloric Stenosis in infants is
Contrast radiology
Gastroscopy
Ultrasound abdomen
CT scan abdomen
Ultrasonography is recommended because its sensitivity and specificity are close to 100% for this disease. Ultrasound is reliable and easily performed and has replaced barium studies as the main investigation.There is a normal variation of pylorus muscle measurements with age and gestation but ultrasound has a very high sensitivity and specificity.
G.I.T