BL23 is located 1.5 cun lateral to the lower border of the spinous process of which vertebra?

• A. L2
• B. L1
• C. L3
• D. L4

Answer: (B)

The main idea is that Back-Shu points are anchored to a specific vertebral level and then located 1.5 cun to the side of the spinous process. BL23, the Kidney Shu point, sits at the level of the second lumbar vertebra and is 1.5 cun lateral to the lower border of that spinous process. This consistent landmark helps ensure the point aligns with the Kidney organ channel on the back. So the correct level is the second lumbar vertebra. The level one vertebra higher would place the point too high on the back.