BL24 is located 1.5 cun lateral to the lower border of the spinous process of which vertebra?

• A. L2
• B. L4
• C. L5
• D. L3

Answer: (D)

BL24 sits on the Bladder channel as a back-shu point whose location follows a clear vertical rule: it’s 1.5 cun lateral to the lower border of the spinous process at the level of the vertebra it corresponds to. For BL24, that level is the third lumbar vertebra, so the point is located at the lower edge of the L3 spinous process and then 1.5 cun to the side along the paraspinal muscles. A useful way to orient yourself is to identify the iliac crest (which helps locate L4) and then go one vertebra up to L3.