Some girls may start menstruating as early as age 10, but others may not get their first period until they are 15 years old. The amount of time between a girl's periods is called her menstrual cycle (the cycle is counted from the start of one period to the start of the next). Some girls will find that their menstrual cycle lasts 28 days, whereas others might have a 24-day cycle, a 30-day cycle, or even longer.
A barium swallow is a special type of X-ray test that helps your doctor take a close look at the back of your mouth and throat, known as the pharynx, and the tube that extends from the back of the tongue down to the stomach, known as the esophagus.
Barium follow through. This test is similar to a barium meal but aims to look for problems in the small intestine. Therefore, you drink the barium liquid but then need to wait 10-15 minutes before any X-rays are taken.This allows time for the barium to reach the small intestine.his test is similar to a barium follow through. However, instead of drinking the barium liquid, a thin tube is passed down your gullet (oesophagus), through the stomach and into the first part of the small intestine.