| GCR | Galactic Cosmic Ray |
|---|---|
| GCR | Glucocorticoid receptor |
| GCRG | Giant cell reparative granuloma |
| GCS | Gamma-glutamylcysteine synthetase |
| GCS | Glascow Coma Scale |
| GCS | Glascow Coma Score |
| GCS | Glasgow Coma Scale Score |
| GCs | Glucocorticoid hormones |
| GCSE | Generalised convulsive status epilepticus |
| GCT | Germ Cell Tumor |