On the chest, in the first intercostal space, 4 cun lateral to the midline (Huágài REN-20), on the mamillary line, which point is located here?

• A. ST 14
• B. ST 12
• C. ST 13
• D. ST 14

Answer: (D)

Chest points on the Stomach meridian are mapped by intercostal space and a horizontal distance from the midline along the mamillary line. The spot described—first intercostal space, 4 cun lateral to the midline, on the mamillary line—fits exactly with ST-14. ST-12 is located higher up in the supraclavicular fossa near the clavicle, not in the first intercostal space on the mamillary line. ST-13 is on the chest along the mamillary line but at a different level. So the described location matches ST-14.