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The *Qianjin Fang* (Prescriptions Worth a Thousand Gold) states: The method of measuring *cun* (units of measurement) is based on the ancient standard where eight *cun* equal one chi. It also takes the first phalanx (proximal interphalangeal joint area) of the middle finger of the patient's left hand (for males) or right hand (for females) as one *cun*.
There are cases where finger lengths vary. In such instances, the transverse width of the first phalanx of the thumb is taken as one *cun*. This requires careful consideration; the skill lies with the practitioner.
The *Waitai Miyao* (Essential Prescriptions from the Imperial Cabinet) also adopts this same method.
Another saying is: Three *cun* corresponds to the length of the entire middle finger.
The *Taiping Shenghui Fang* (Holy and Beneficent Prescriptions of the Taiping Era) states: Currently, the distance between the two inner transverse creases of the second phalanx (middle segment) of the middle finger of the patient's left hand (for males) or right hand (for females) is taken as one *cun*. Diseases treated according to this method have mostly healed, so it is now established as the standard for locating acupoints. Shi Cangyong also uses the *Shenghui Fang* as the criterion.
Using a strip of wax paper or thin bamboo sliver, measure the distance between the upper and lower transverse creases of the middle segment of the middle finger of the patient's left hand (for males) or right hand (for females) as one *cun*. This is called "Tongshen Cun" (Body Inch). (If measuring along the side of the flexed finger joint, the distance between the upper and lower angles of the middle segment on the dorsal and ventral sides is taken as one *cun*; if extending the finger, the longer distance from the transverse crease below the first phalanx to the second transverse crease from the top on the middle segment is taken as one *cun*. This matches the length obtained by flexing the finger. However, fingers may vary among individuals, and fingerprint patterns also differ; thus, careful deliberation is required.)
This folded paper, equal in length to the Tongshen Cun, is set at six *cun*. Each *cun* is marked with ink lines, ensuring no variation in length. Cut off and store it for use in measuring moxibustion points.
Three *cun* lateral to the midpoint below the fourth thoracic vertebra on the spine is the Gao Huang (BL 43) point, which is where the Qi of the Foot-Taiyang Bladder Meridian emerges.

Instruct the patient to sit upright on a chair with back support, placing both feet flat on the ground, with knees and thighs at the same height, legs together, and toes aligned. Remove all upper body clothing completely. (If not fully removed, sleeves binding the arms will prevent the scapulae from separating, making accurate point location impossible. If the patient has weak Qi and fears cold, they may put clothes back on, inserting arms into sleeves, keeping the collar under the chest and lapels crossed over the waist. After marking the points, during moxibustion, wear a vest and tie it tightly near the acupoint to avoid interference with the flame of the seated moxa cone.)
Flex the spine and extend the arms, pressing both hands onto the knees so that the middle fingers align with the center of the kneecaps, with the thumbs pressed closely together, their tips level with the anterior edge of the patella. Apply slight upward force to lift straight, keeping the wrists neutral without tilting, bending, or shaking. (Duan Yancong Zhongmou Daifu stated: Shi Cangyong believed that pressing the left hand on the right knee and the right hand on the left knee would open the scapulae. Attempting this method resulted in crossed hands with uneven wrists and tilted scapulae. One should stop doing this and adhere to the old method: pressing the left hand on the left knee is correct.)