gi series การใช้

Although somewhat less useful, an upper GI series ( x-rays taken after the baby drinks a special contrast agent ) can be diagnostic by showing the narrowed pyloric outlet filled with a thin stream of contrast material; a " string sign " or the " railroad track sign ".
The use of the upper GI series for the diagnosis of HPS, which was the primary diagnostic tool for this condition in the 1980s and 1990s, has been largely replaced by the use of ultrasound, which is less invasive and can visualize the thickened pylorus, giving actual measurements of this thickening.