Which acupuncture point is located in the fourth intercostal space, 2 cun lateral to the midline?

• A. KD 24
• B. KD 23
• C. KD 25
• D. KD 26

Answer: (B)

Locating points on the chest uses two coordinates: the intercostal space and how far a point is from the midline. The Kidney channel has chest points mapped to specific spaces and lateral distances from the midline, measured in cun. The description—fourth intercostal space, 2 cun lateral to the midline—fits Kidney 23 exactly. Being in the fourth intercostal space places you at the correct vertical level, and 2 cun lateral from the midline places you on the correct horizontal position on the chest wall. That precise match is why Kidney 23 is the correct choice. The other possibilities would sit in different intercostal spaces or at different lateral offsets, so they don’t match this location.