Which BL point is located 1.5 cun lateral to the midline at the level of the third posterior sacral foramen?

• A. BL 28
• B. BL 30
• C. BL 29
• D. BL 31

Answer: (C)

The Bladder channel along the lower back is mapped to the posterior sacral foramina, with each point located about 1.5 cun lateral to the midline at a specific foraminal level. The level of the third posterior sacral foramen corresponds to BL-29, placed 1.5 cun lateral to the midline there. That is why this point is the correct choice. To find it, locate the midline on the lower back, identify the third posterior sacral foramen, then measure 1.5 cun outward. Nearby bladder points sit at adjacent foramina, but the question specifies the third foramen, which aligns with BL-29.