BL-15's relation to the spine is best described as:

BL-15, known as Xin Shu or Heart Back, is located on the back along the bladder meridian and is pertinent for treating heart-related issues in Traditional Chinese Medicine. Its anatomical location is specifically 1.5 cun lateral to the spinous process of the fifth thoracic vertebra (T5).

This positioning is crucial because it aligns with the traditional anatomical landmarks recognized in practice. The distance of 1.5 cun is a standard measurement used in acupuncture to locate points accurately relative to the spinal column. This point is significant for diagnosing and treating conditions linked to heart function, both physically and energetically.

Understanding the precise locations of acupuncture points in relation to the spine helps practitioners effectively target treatments for various conditions, ensuring that they are addressing the right areas aligned with the meridian pathways.