Mei-Shun received a letter from Tsuchiura City, recommending a blood test. It aims to recognize particular materials secreted from the stomach, they say. One of them is pepsinogen (PG) whose ratio of I to II shows how much your stomach shrinks. If you are infected with helicobacter pyroli, PG I will be higher than 70 while I/II ratio more than 3. Fortunately, both of her results were proved negative.