Commentary for Zhongzhu KID-15
All the Kidney points on the abdomen (from Henggu KID-11 to Youmen KID-21) are also part of the Penetrating Vessel. Thus their indications are related to both the Channel and the Vessel.
The Penetrating Vessel is the 'Sea of Blood', 'Sea of the 12 Channel' as well as the 'Sea of the abdomen avenue'. Thus its points are often able to invigorate the Blood and Qi and remove Stagnation, especially in the abdomen.
Zhongzhu KID-15 is not a major point of the Kidney Channel. Apart from the above features, its main function is to regulate the intestines and Lower Burner.