Pulse diagnosis is a diagnostic technique used in Ayurveda, traditional Chinese medicine, traditional Mongolian medicine, Siddha medicine, traditional Tibetan medicine, and Unani.
The main sites for pulse assessment are the radial arteries in the left and right wrists, where it overlays the styloid process of the radius, between the wrist crease and extending proximal, approximately 5 cm in length. In traditional Chinese medicine, the pulse is divided into three positions on each wrist. The first pulse closest to the wrist is the cun position, the second guan, and the third pulse position furthest away from the wrist is the chi.
There are several systems of diagnostic interpretation of pulse findings utilized in the Chinese medicine system.
Some systems utilize overall pulse qualities, looking at changes in the assessed parameters of the pulse to derive one of the traditional 28 pulse types.
Other approaches focus on individual pulse positions, looking at changes in the pulse quality and strength within the position, with each position having an association with a particular body area.For example, each of the paired pulse positions can represent the upper, middle and lower cavities of the torso, or are associated individually with specific organs. (For example, the small intestine is said to be reflected in the pulse at the left superficial position, and the heart at the deep position.)
Various classic texts cite different arrangements to the pairings of organs, some omitting the second organ from the pulse entirely while others show organ systems reflecting the acupuncture channels (five phase pulse associations), and another the physical organ arrangement used in Chinese herbal medicine diagnosis (Li Shi Zhen).
Generally, the commonly used organ associations are: first position on the left hand represents the heart and small intestine, the second, liver and gallbladder, and third the kidney yin and the bladder. On the right hand, the first position is representative of the lungs and large intestine, the second of the spleen and stomach, and the third represents the kidney yang and uterus or triple burner.
The strengths and weaknesses of the positions are assessed at 3 depths each, namely fu (floating), zhong (middle) and chen (deep). These 9 positions are used to assess the patient diagnostically, along with the different qualities and speed of the pulse, such as the Shu/Sun pulse classification system.