| GUI | Graphical User Interface |
|---|---|
| GUM | Genito-Urinary Medicine |
| Guo | guanosine |
| GUR | glucose utilization rate |
| GUS | Beta-glucuronidase |
| GUS | Promoter-beta-glucuronidase |
| GUSB | beta-Glucuronidase |
| GUSTO-I | Global Utilization of Streptokinase and TPA for Occluded Coronary Arteries |
| gut GLI | Gut glucagon-like immunoreactivity |
| GUV | giant unilamellar vesicle |