| COT | colony overlay test; content of thought; contralateral optic tectum; critical off-time |
|---|---|
| CRST | calcinosis, Raynaud phenomenon, sclerodactyly, telangiectasia [syndrome]; corrected sinus recovery t... |
| CSNRT, cSNRT | corrected sinus node recovery time |
| CSRT | corrected sinus recovery time |
| CSTT | cold-stimulation time test |