garg (gargle)

GAS (general adaptation syndrome)

GAVE (gastric antral vascular ectasia)

GB (Guillain-Barre)

GB (gallbladder)

GBM (glomerular basement membrane)

GBS (Guillain-Barre syndrome)

GBS (Group B streptococcus)

GC (gonococcus or gonorrheal (gonorrhea coccii))

GC-MS (gas chromatography-mass spectrometry)