素问·血气形志 Blood and Qi, Body and Mind
夫人之常数，太阳常多血少气，少阳常少血多气，阳明常多气多血，少阴常少血多气，厥阴常多血少气，太阴常多气少血，此天之常数。足太阳与少阴为表里，少阳与厥阴为表里，阳明与太阴为表里，是为足阴阳也。手太阳与少阴为表里，少阳与心主为表里，阳明与太阴为表里，是为手之阴阳也。今知手足阴阳所苦，凡治病必先去其血，乃去其所苦，伺之所欲，然后写有馀，补不足。
欲知背俞，先度其两乳间，中折之，更以他草度去半已，即以两隅相拄也，乃举以度其背，令其一隅居上，齐脊大椎，两隅在下，当其下隅者，肺之俞也。得下一度，心之俞也。复下一度，左角肝之俞也，右角脾之俞也。复下一度，肾之俞也。是谓五藏之俞，灸刺之度也。
形乐志苦，病生于脉，治之以灸刺。形乐志乐，病生于肉，治之以针石。形苦志乐，病生于筋，治之以熨引。形苦志苦，病生于咽嗌，治之以百药。形数惊恐，经络不通，病生于不仁，治之以按摩醪药。是谓五形志也。
刺阳明出血气，刺太阳，出血恶气，刺少阳，出气恶血，刺太阴，出气恶血，刺少阴，出气恶血，刺厥阴，出血恶气也。
As for the constant proportions in man: the taiyang channels normally have abundant blood and little qi; the shaoyang channels normally have little blood and abundant qi; the yangming channels normally have abundant qi and abundant blood; the shaoyin channels normally have little blood and abundant qi; the jueyin channels normally have abundant blood and little qi; the taiyin channels normally have abundant qi and little blood. These are the constant proportions ordained by heaven. The foot taiyang and shaoyin are exterior-interior pairs, the shaoyang and jueyin are exterior-interior pairs, and the yangming and taiyin are exterior-interior pairs — these are the yin and yang of the foot channels. The hand taiyang and shaoyin are exterior-interior pairs, the shaoyang and the pericardium (heart-ruler) are exterior-interior pairs, and the yangming and taiyin are exterior-interior pairs — these are the yin and yang of the hand channels. Now, knowing what afflicts the hand and foot yin and yang channels, in treating disease one must first remove excess blood, and then remove what afflicts the patient, attending to what the qi desires, and only then drain what is in excess and supplement what is deficient.
To find the back transport (shu) points: first measure the distance between the two nipples, and fold the measuring cord in half at the middle point. Then take another stalk and measure off half of that folded length, so that the two ends of this shorter piece, when joined at right angles with the first, form a set-square. Then raise it to measure along the back, positioning one corner at the top, level with the Da Zhui point on the spine, with the other two corners below. The point at the lower corner is the lung's transport point. Measuring one further increment down is the heart's transport point. Measuring one further increment down, the left corner is the liver's transport point and the right corner is the spleen's transport point. Measuring one further increment down is the kidney's transport point. These are called the transport points of the five viscera, the measurements for moxibustion and needling.
When the body is at ease but the mind is troubled, disease arises in the vessels; treat it with moxibustion and needling. When the body is at ease and the mind is at ease, disease arises in the flesh; treat it with needles and stone probes. When the body is troubled but the mind is at ease, disease arises in the sinews; treat it with hot compresses and guided stretching exercises. When the body is troubled and the mind is troubled, disease arises in the throat; treat it with the hundred medicines. When the body is repeatedly startled and frightened, the channels and network vessels become blocked, and disease arises as numbness; treat it with massage and medicated wine. These are called the five combinations of body and mind.
In needling the yangming channels, bleed and let out qi. In needling the taiyang channels, bleed but avoid letting out qi. In needling the shaoyang channels, let out qi but avoid bleeding. In needling the taiyin channels, let out qi but avoid bleeding. In needling the shaoyin channels, let out qi but avoid bleeding. In needling the jueyin channels, bleed but avoid letting out qi.