How to find

Quick method: Locate the posterior superior iliac spine (PSIS): from the rima ani, palpate 3 cun (1 handbreadth) in a superior and lateral direction at a 45° angle, until you can feel a distinct bony ridge (often superficially visible by a dimple). BL-28 is located slightly inferiorly and medially to the PSIS, 1.5 cun lateral to the midline on the level of the 2nd sacral foramen.Located on the same level are BL 32 (Second Foramen) (over the 2nd sacral foramen) and BL 53 (Bladder Vitals) (3 cun lateral to the midline). BL 27 (Small Intestine Shu) is located slightly superiorly and medially to the PSIS on the level of the 1st sacral foramen.


1.5 cun lateral to the posterior midline, on the level of the second sacral foramen.


  • Regulates the Bladder and the Lower Heater, clears Damp- Heat from the Lower Heater, removes stagnation and transforms masses
  • Benefits the lumbar region and the legs


Back-shu point of the Bladder