| G | Gas |
| G | glucose |
| G | Good |
| G | gram |
| G | gravida |
| G | Guiac |
| G | gallop |
| G | Ganglion |
| G | Gap |
| G | gastrin |
| G | Gastrostomy |
| G | gender |
| G | genome |
| G | genitalia |
| G | gingiva |
| G | glycogen |
| G | Globulin |
| G- | gram-negative |
| G&D | growth and development |
| G&S | gait and stance |
| g/dl | grams per deciliter |
| G/P | gravida/para |
| G+ | gram-positive |
| G+C | gram -positive cocci |
| G+R | gram-positive rods |
| GA | general appearance |
| GA | gastric analysis |
| GA | general anesthesia |
| GA | Gamblers Anonymous |
| GA | gestational age |
| GA | ginger ale |
| Ga | gallium |
| Ga scan | gallium scan |
| GAA | glacial acetic acid |
| GAA | glioma-associated antigens |
| GAA | glutamic acid |
| GABA | gamma-aminobutyric acid |
| GABHS | group A bet hemolytic streptococci |
| GABS | group A beta streptococci |
| GAD | generalized anxiety disorder |
| GAE | granulomatous amebic encephalitis |
| GAF | Global Assessment of Function |
| GAF | geographic adjustment factors |
| GAG | glycosaminoglycan |
| GAGPS | glycosaminoglycan polysulfate |
| GAGS | global acne grading system |
| GAL | gallon |
| GAM | Gamma Knife |
| GAM | generalised additive models |
| Gamma-GT | gamma-glutamyl transpeptidase |
| GAMT | guanidinoacetate methyltransferase |
| GAN | giant axonal neuropathy |
| GAO | gastric acid output |
| GAO | glycogen-accumulating organisms |
| GAP | GTPase activating protein |
| GAR | gonnococcal antibody reaction |
| GAS | general adaption syndrome |
| Gastroc | gastrocnemius |
| GAT | geriatric assessment team |
| GAT | granulocyte agglutination test |
| GAT | Grip Ability Test |
| GAU | geriatric assessment unit |
| GAVE | gastric antral vascular ectasia |
| GAW | glottal area waveform |
| GB | gallbladder |
| GBA | ganglionic blocking agent |
| GBA | guilt by association |
| GBBS | group B beta hemolytic |
| GBD | global burden of disease |
| GBD | Gallbladder disease |
| GBD | gender behavior disorder |
| GBE | Ginkgo biloba extract |
| GBG | gonadal-steroid binding globulin |
| GBH | gamma benzene hexachloride |
| GBIA | Guthrie bacterial inhibition assay |
| GBL | gamma butyrolactone |
| GBM | glioblastoma multiforme |
| GBP | gabapentin |
| GBP | gastric bypass |
| GBR | gamma band response |
| GBR | good blood return |
| GBV-C | GB virus type C |
| GBW | generalized bladder extraction |
| GBX | gall bladder extraction |
| GC | gas chromatography |
| GC | gastric cancer |
| GC | glucocorticoid |
| GC | gonococci |
| GC | good condition |
| G-C | gram-negative cocci |
| GCA | gastric cancer |
| GCA | giant cell angiofibroma |
| GCA | Graft coronary arteriosclerosis |
| GCA | guanylyl cyclase A |
| GCA | General conceptual ability |
| GCBP | gated cardiac blood pool |
| GCC | glassy cell carcinoma |
| GCDFP | gross cystic disease fluid protein |
| GCE | general conditioning exercise |
| GCI | General Cognitive Index |
| GCI | glial cytoplasmic inclusion |
| GCI | global cerebral ischemia |
| GCI | global clinical impression |
| GCL | generalized congenital lipodystrophy |
| GCM | Geriatric Care Managers |
| GCM | General Circulation Models |
| GCM | giant cell myocarditis |
| GC-O | gas chromatography-olfactometry |
| GCP | Good Clinical Practice |
| GCP | gastritis cystica polyposa |
| GCP | generalized chronic periodontitis |
| GCR | glucocorticoid |
| GCR | Glucocorticoid receptor |
| GCR | G-protein-coupled receptor |
| GCS | Glasgow Coma Scale |
| GCT | general care and treatment |
| GCT | giant-cell tumor |
| GCU | gonococcal urethritis |
| GCV | great cardiac vein |
| GCV | ganciclovir |
| GD | gastric distension |
| GD | Gaucher disease |
| GD | Graves disease |
| GDA | gastroduodenal artery |
| GDH | glutamic dehydrogenase |
| GDJ | gastroduodenal junction |
| GDM | gestational diabetes mellitus |
| GDNF | glial derived neurotrophic factor |
| GDP | gamma-detecting probe |
| GDP | general dental practice |
| GDR | glucose disposal rate |
| GDS | Geriatric Depression Scale |
| GE | Gastroesophageal |
| GE | gastric emptying |
| GE | gastrointestinal endoscopy |
| GE | generalized epilepsy |
| GE | gastroenteritis |
| GEA | gastroepiploic artery |
| GEC | galactose elimination capacity |
| GED | General Educational Development |
| GED | gastric emptying duration |
| GED | gastric epithelial dysplasia |
| GEE | gait energy expenditure |
| GEE | glycine ethyl ester |
| GEF | graft-enteric fistula |
| GEH | generalized eruptive histiocytosis |
| GEJ | gastroesophageal junction |
| GEL | gas exchange lung |
| GEL | giant esophageal leiomyoma |
| GEM | gemcitabine |
| GEM | Ginkgo Evaluation of Memory |
| GEM | gemfibrozil |
| GEM | general equivalence mapping |
| GEN | general anethesia |
| GEN | gender |
| GEN | genetics |
| GEN | genital |
| GENT | gentamicin |
| GEP | gastroenteropancreatic |
| GEQ | generic equivalent |
| GEQ | genome equivalents |
| GEQ | global efficacy question |
| GER | Gastric emptying rate |
| GER | gastroesophageal reflux |
| GES | Group E streptococcus |
| GES | gastric emptying studies |
| GEST | gestational |
| GET | gastric emptying time |
| GEU | geriatric evaluation unit |
| GF | gastric fistula |
| GF | gluten free |
| GFAAS | graphite furnace atomic absorptionspectrometry |
| GFAP | glial fibrillary acidic protein |
| GF-BAO | gastric fluid, basal acid output |
| GFD | gluten-free diet |
| GFJ | grapefruit juice |
| GFM | good fetal movement |
| GFP | green fluorescent protein |
| GFR | glomerular filtration rate |
| GFS | glaucoma filtering surgery |
| GG | gamma globulin |
| GG | Gates-Glidden |
| GGDS | global genome damage score |
| GGE | Gastrografin enema |
| GGF | glial growth factor |
| GGF | great grandfather |
| GGM | Glucose-Galactose Malabsorption |
| GGM | great grandmother |
| GGO | ground-glass opacity |
| GGS | group G streptococci |
| GGT | gamma-glutamyl-transferase |
| GH | growth hormone |
| GH | general health |
| GH | genetic hemochromatosis |
| GH | genital herpes |
| GH | gingival hyperplasia |
| GHB | gamma hydroxybutyrate |
| GHB | glycosylated hemoglobin |
| GHD | growth hormone deficiency |
| GHI | growth hormone insufficiency |
| GHJ | glenohumeral joint |
| GHQ | General Health Questionnaire |
| GHRF | growth hormone releasing factor |
| GI | gastrointestinal |
| GI | gingival index |
| GI | glycemic index |
| GIA | gastrointestinal anastomosis |
| GIB | gastrointestinal bleeding |
| GIB | gastric ileal bypass |
| GIC | general immunocompetence |
| GID | gastrointestinal distress |
| GID | gender identity disorder |
| GIFT | gamete intrafallopian transfer |
| GIH | gastrointestinal hemorrhage |
| GIK | glucose-insulin-kalium |
| GIL | gastrointestinal lymphoma |
| GING | gingiva |
| GING | gingivectomy |
| GIO | glucocorticoid-induced osteoporosis |
| GIP | gastric inhibitory peptide |
| GIR | global improvement rating |
| GIR | glucose infusion rate |
| GIS | gas in stomach |
| GIS | gastrointestinal series |
| GIT | gastrointestinal tract |
| GIWU | gastrointestinal work-up |
| GJ | gastrojejunal |
| GJ | gastrojejunostomy |
| GJH | generalized joint hypermobility |
| GJIC | gap junction intercellular communication |
| GJT | gastrojejunostomy tube |
| GK | glycerol kinase |
| GK | Gamma Knife |
| GKRS | gamma-knife radiosurgery |
| GKS | gamma-knife surgery |
| GKT | guilty knowledge test |
| GKT | gamma-knife thalamotomy |
| GL | gastric lavage |
| GL | glaucoma |
| GLA | gamma-linolenic acid |
| GLA | glucose-lowering agents |
| GLB | gay, lesbian and bisexual |
| GLB | globulin |
| GLC | gas-liquid chromatography |
| GLD | generalized lymphadenopathy disease |
| GLD | glucose dehydrogenase |
| GLIO | glioblastoma |
| GLL | green-light laser |
| GLM | general linear model |
| GLM | glioblastoma multiforme |
| GLM | glomeruli |
| GLN | glomerulonephritis |
| GLOC | gravity-induced loss of consciousness |
| GLP | Good Laboratory Practice |
| GLP | glycolipoprotein |
| GLP | glucagon-like peptide |
| GLR | gravity lumbar reduction |
| GLU | glutamic acid |
| GLU | glucose |
| GLU | glutamate |
| GLU | glutamine |
| GLU | glucagon |
| GLU 5 | five-hour glucose tolerance test |
| GLUC | glucose |
| GM | gastric mucosa |
| GM | general medicine |
| GM | genetically modified |
| GM | geometric mean |
| GM | gram |
| GM | grand mal |
| GM | gamma |
| GM | Geiger-Muller |
| GM- | gram negative |
| GM&S | general medicine and surgery |
| GM+ | gram positive |
| GMC | general medical clinic |
| GMC | general medical condition |
| GME | gaseous microemboli |
| GME | Graduate Medical Education |
| GMF | general medical floor |
| GMH | germinal matrix hemorrhage |
| GML | gingival margin levels |
| GMOS | general medical officers |
| GMOS | genetically modified organisms |
| GMP | Good Manufacturing Practice |
| GMP | General Medical Practitioner |
| GMP | general medical panel |
| GMR | Gallups, Murmurs, Rubs |
| GMR | gentamicin resistance |
| GMR | geometric mean ratio |
| GMR | geometric mean ratios |
| GMR | glucose metabolic rate |
| GMR | galvanic muscle stimulation |
| GMTS | geometric mean antibody titers |
| GN | glomerulonephritis |
| GN | graduate nurse |
| GN | gram-negative |
| GNA | general nursing assistance |
| GNA | Galanthus nivalis agglutinin |
| GNB | ganglioneuroblastoma |
| GNB | gram-negative bacilli |
| GNB | gram-negative bacteremia |
| GNC | gram-negative cocci |
| GND | gram-negative diplococci |
| GND | generalized neuroaxonal dystrophy |
| GNG | gluconeogenesis |
| GNID | gram-negative intracellular diplococci |
| GNP | Gerontological Nurse Practitioner |
| GNP | glomerulonephritis |
| GNR | gram-negative rods |
| GNS | gram-negative sepsis |
| GNT | giant negative T waves |
| GNT | Graduate Nurse Technician |
| GO | glucose oxidase |
| GO | gonorrhea |
| GO | Graves ophthalmopathy |
| GOAT | Galveston Orientation and Amnesia Test |
| GOBI | growth monitoring, oral rehydration, breastfeeding, and immunization |
| GOCS | Global Obsessive-Compulsive Scale |
| GOD | Gift Of Desperation |
| GOD | glucose oxidase |
| GOG | Gynecologic Oncology Group |
| GOJ | gastro-oesophageal junction |
| GOLD | Global Initiative for Chronic Obstructive LungDisease |
| GOM | granular osmiophilic material |
| GOMER | get out of my emergency room |
| GON | gonococcal ophthalmia neonatorum |
| GON | greater occipital nerve |
| GONIO | gonioscopy |
| GOO | gastric outlet obstruction |
| GOR | gastro-oesophageal reflux disease |
| GOS | General Ophthalmic Services |
| GOS | glasgow outcome scale |
| GOS | Glasgow outcome score |
| GOS | galacto-oligosaccharides |
| GOT | glucose oxidase test |
| GOT | goals of treatment |
| GOX | glucose oxidation |
| GP | geometric progression |
| GP | General Practice |
| GP | general practitioners |
| GP | glans penis |
| GP | globus pallidus |
| GP | glycoprotein |
| GPA | gelatin particle agglutination |
| GPA | global program on AIDS |
| GPA | glycoprotein A |
| GPB | gram-positive bacilli |
| GPC | gel-permeation chromatography |
| GPC | gram-positive cocci |
| GPGL | gamma probe guided lymphoscintigraphy |
| GPI | general paralysis of the insane |
| GPI | globus pallidus internus |
| GPN | General Pediatric Nurse |
| GPN | Graduate Practical Nurse |
| GPN | glossopharyngeal nerve |
| GPS | Goodpasture syndrome |
| GPT | glutamic pyruvic transaminase |
| GPX | glutathione peroxidase |
| GR | gastric resection |
| GR | growth rate |
| gr | grain |
| G-R | gram-negative rods |
| GRA | gated radionuclide angiography |
| GRA | genotype representation analysis |
| GRA | granisetron |
| GRAS | generally recognized as safe |
| Grav. | gravid |
| GRC | gastric remnant cancers |
| GRC | glucocorticoid receptor complex |
| GRD | GAP related domain |
| GRD | gastroesophageal reflux disease |
| GRD | gender role definition |
| GRE | glycopeptide-resistant enterococci |
| GRE | gradient-recalled echo |
| GRKP | gentamicin-resistant Klebsiella pneumoniae |
| GRN | gene regulatory network |
| GRN | granules |
| GRO | ground reaction orthosis |
| GRO | growth-regulated oncogene |
| GRP | Good Regulatory Practice group |
| GRR | gross reproduction rate |
| GRT | gastric residence time |
| GRT | glandular replacement therapy |
| GRV | gastric residual volume |
| GS | gallstone |
| GS | generalized seizure |
| GS | general surgery |
| GSCU | geriatric skilled care unit |
| GSD | glycogen storage disease |
| GSD | Glutathione synthetase deficiency |
| GSD | gallstone disease |
| GSE | genital self-examination |
| GSH | glomerulus-stimulating hormone |
| GSH | glutathione |
| GSI | genuine stress incontinence |
| GSK | GlaxoSmithKline |
| GSM | Global System of Mobile Communication |
| GSP | generalized social phobia |
| GSR | galvanic skin resistance |
| GSR | gastrosalivary reflex |
| GSR | gunshot residue |
| GSS | genotypic-sensitivity scores |
| GST | glutathione S-transferase |
| GSUI | genuine stress urinary incontinence |
| GSV | gestational sac volume |
| GSV | greater saphenous vein |
| GSW | gunshot wound |
| GSWA | gunshot wound to abdomen |
| GT | gait |
| GT | gastrostomy |
| GT | gene therapy |
| GTA | gene transfer agent |
| GTA | glycerol teichoic acid |
| GTA | glutaraldehyde |
| GTB | gastrointestinal tract bleeding |
| GTC | generalized tonic-clonic |
| GTD | gestational trophoblastic disease |
| GTE | general therapeutic exercise |
| GTF | gastrostomy tube feedings |
| GTF | glucose tolerence factor |
| GTH | gonadotropic hormone |
| GTO | Golgi tendon organ |
| GTP | glutamyl transpeptidase |
| GTR | granulocyte turnover rate |
| GTR | gross total resection |
| GTS | Gilles de la Tourette syndrome |
| GTS | glucose transport system |
| GTS | getting to sleep |
| GTT | Glucose Tolerance Test |
| GTT | gestational transient thyrotoxicosis |
| gtt. | drops |
| G-tube | gastrostomy tube |
| GU | gastric ulcer |
| GU | Genitourinary |
| GU | glucose uptake |
| GU | gonococcal urethritis |
| GU | gastric upset |
| GUD | genital ulcer disease |
| GUI | genitourinary infection |
| GUM | Genitourinary Medicine |
| GUS | gastric ulcers |
| GUS | genito-urinary sphincter |
| GV | gentian violet |
| GV | growth velocity |
| GVF | good visual fields |
| GVG | gamma-vinyl GABA |
| GVH | generalized visceral hypersensitivity |
| GVL | graft-versus leukemia |
| GVM | Graft-versus malignancy |
| GVS | galvanic vestibular stimulation |
| GVS | gas vesicles |
| GVS | gastric vertical stapling |
| GVT | graft-versus-tumor |
| GWA | gunshot wound of the abdomen |
| GWBI | General Well-Being Index |
| GWS | GABA withdrawal syndrome |
| GWS | Gulf-war syndrome |
| GWX | guide-wire exchange |
| GXT | graded exercise test |
| Gy | grey |
| GYN | gynecology |
| GZTS | Guilford-Zimmerman Temperament Survey |