Which ST point on the abdomen is 5 cun above the umbilicus, 2 cun lateral to the midline, level with Shàngwǎn REN-13?

• A. ST 20
• B. ST 21
• C. ST 22
• D. ST 23

Answer: (A)

The abdomen points along the ST channel are placed 2 cun lateral to the midline and rise in fixed vertical steps from the umbilicus. Shangwan (Ren-13) sits on the midline, 5 cun above the umbilicus. A point described as 5 cun above the umbilicus and 2 cun lateral to the midline would align with the ST point at that exact location, which is ST-20. The other options would correspond to different vertical levels (not matching the 5-cun height) and thus don’t fit both coordinates. ST-20 is the correct location.