| Gamma GT | GGT | SST/Serum | 48 hours |
| Gardnerella vaginalis | GVAG | Swab/Urine/Tampon | 48 hours |
| Globulin | GLOB | SST/Serum | 48 hours |
| Glucose | GLU | SST/Serum | 48 hours |
| Glucose tolerance test | GLUT | SST/Serum | 48 hours |
| Glycosylated HB | HBA1 | EDTA | 48 hours |
| Gonorrhoea | NG | Swab/Urine/Tampon | 48 hours |