Beyond their place in internal alchemy, jing, qi and shen function as the working diagnostic categories of everyday Chinese medical practice, and seeing how a practitioner uses them clarifies what the theory means at the bedside rather than in the alchemical text.
A traditional Chinese medicine practitioner assesses shen largely by observation: clarity in the eyes, coherent speech and a settled bearing indicate strong shen, while a dull gaze or emotional flatness are read as signs of disturbed shen, a sign considered so significant that classical texts hold a patient with intact shen may recover even from serious illness, while one who has lost it faces a poor prognosis regardless of other findings. Qi is assessed chiefly through pulse diagnosis, distinguishing dozens of named pulse qualities at multiple wrist positions, each associated with the state of qi in specific organ systems, alongside tongue diagnosis, in which the tongue's color and coating are read as indicators of qi and fluid distribution. Jing, the deepest and most constitutional of the three, is assessed less through momentary signs than through a patient's overall constitutional history, growth, reproductive function and bone strength, since jing is traditionally associated with the kidneys and with long-term development and aging rather than acute presentation.
This diagnostic use predates and is more widely practiced today than the internal alchemical tradition proper, illustrating a general pattern: concepts developed within an esoteric soteriological framework aimed at transcendence were also, and earlier, embedded in an entirely practical medical system aimed at ordinary health, the two systems sharing vocabulary while pursuing different ends.