3 cun lateral to the lower border of the spinous process of the 10th thoracic vertebra (T10).
How to locate
First locate the spinous process of the 7th cervical vertebra (C7), which is still palpable when the neck is being flexed and extended, while the 6th cervical vertebra (C6) starts to slide anteriorly and gradually disappears. The spinous process of the 10th thoracic vertebra (T10) is ten spinous process below C7.
Or first locate the spinous process of T7, which is level with the inferior angle of the scapula, when the patient is seated with their arms hanging down. T10 is three thoracic vertebra below.
Yanggang BL-48 is 3 cun lateral to the lower border of T10. Danshu BL-19 is at the same level but 1.5 cun lateral to T10.
Points located between Fufen BL-41 and Zhibian BL-54 are in the lateral branch of the Bladder Channel, while these between Fengmen BL-12 and Baihuanshu BL-30 are in the medial branch.