| ESR | Einstein stoke radius; electric skin resistance; electron spin resonance; equipment service report; ... |
|---|---|
| ETS | educational testing service; electrical transcranial stimulation |
| FNS | frontier nursing service; functional neuromuscular stimulation |
| FS | factor of safety; Fanconi syndrome; Felty syndrome; fibromyalgia syndrome; field stimulation; Fisher... |
| FSU | family service unit; functional spine unit |