Internal Medicine Acronyms

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Internal Medicine Alphabet – G

S. No	Acronyms	Full Form	Short Explanation	Practical Example
G001	GABA	Gamma-Aminobutyric Acid	Primary inhibitory neurotransmitter in CNS.	Benzodiazepines enhance GABA activity.
G002	GAD	Generalized Anxiety Disorder	Chronic, excessive worry and anxiety.	Patient with persistent anxiety diagnosed with GAD.
G003	GALT	Gut-Associated Lymphoid Tissue	Immune tissue protecting gastrointestinal tract.	Peyer’s patches are part of GALT.
G004	GB	Gallbladder	Organ that stores bile for digestion.	Gallstones detected in the GB by ultrasound.
G005	GBS	Guillain-Barré Syndrome	Autoimmune neuropathy causing paralysis.	GBS developed after viral infection.
G006	GBS	Group B Streptococcus	Bacteria causing neonatal sepsis and meningitis.	Pregnant women screened for GBS.
G007	GCS	Glasgow Coma Scale	Tool to assess consciousness after brain injury.	GCS 7 indicates severe head injury.
G008	GCT	Glucose Challenge Test	Screening test for gestational diabetes.	GCT performed at 24–28 weeks pregnancy.
G009	GDM	Gestational Diabetes Mellitus	Diabetes diagnosed during pregnancy.	Insulin used to manage GDM.
G010	GERD	Gastroesophageal Reflux Disease	Acid reflux causing heartburn/regurgitation.	Lifestyle changes recommended for GERD.
G011	GH	Growth Hormone	Hormone regulating growth and metabolism.	GH deficiency treated with recombinant GH.
G012	GHD	Growth Hormone Deficiency	Condition with insufficient GH secretion.	Child with stunted growth evaluated for GHD.
G013	GI	Gastrointestinal	Pertaining to stomach and intestines.	GI bleed evaluated with endoscopy.
G014	GIB	Gastrointestinal Bleeding	Hemorrhage in GI tract.	Melena suggests upper GIB.
G015	GIST	Gastrointestinal Stromal Tumor	Rare tumor of GI tract from interstitial cells.	GIST treated with imatinib.
G016	GIT	Gastrointestinal Tract	Entire digestive system pathway.	Colonoscopy examines lower GIT.
G017	GLP-1	Glucagon-Like Peptide-1	Hormone enhancing insulin secretion.	GLP-1 agonists used in T2DM.
G018	GLUT	Glucose Transporter	Family of proteins moving glucose into cells.	GLUT4 activated by insulin in muscle.
G019	GM-CSF	Granulocyte-Macrophage Colony Stimulating Factor	Stimulates white blood cell production.	GM-CSF used in chemotherapy-induced neutropenia.
G020	GNB	Gram-Negative Bacilli	Group of bacteria with unique cell wall.	E. coli is a common GNB.
G021	GNP	Gemcitabine + Nab-Paclitaxel	Chemotherapy regimen for pancreatic cancer.	GNP used in metastatic pancreatic carcinoma.
G022	GOF	Gain of Function	Mutation that increases protein activity.	GOF mutation found in oncogenes.
G023	GORD	Gastro-Oesophageal Reflux Disease	UK equivalent of GERD.	Patient in UK diagnosed with GORD.
G024	GOT	Glutamate Oxaloacetate Transaminase	Former name of AST enzyme.	GOT elevated in liver injury.
G025	GP	General Practitioner	Primary care physician.	Patient consulted GP before referral.
G026	GPA	Granulomatosis with Polyangiitis	Autoimmune vasculitis affecting airways/kidneys.	GPA confirmed by c-ANCA test.
G027	GPC	Gram-Positive Cocci	Group of spherical bacteria.	Staphylococcus is a common GPC.
G028	GPI	Glycosylphosphatidylinositol	Molecule anchoring proteins to cell membrane.	GPI deficiency seen in PNH.
G029	GPL	Generalized Periodic Discharges	EEG finding in encephalopathy.	GPL patterns found in metabolic encephalopathy.
G030	GPP	Generalized Pustular Psoriasis	Severe inflammatory skin disease.	GPP treated with immunosuppressants.
G031	GPR	G Protein-Coupled Receptor	Large family of cell-surface receptors.	Beta-adrenergic receptor is a GPR.
G032	GPT	Glutamate Pyruvate Transaminase	Former name of ALT enzyme.	GPT elevated in hepatitis.
G033	GQOL	General Quality of Life	Health-related well-being measure.	GQOL surveys used in chronic illness.
G034	GR	Glucocorticoid Receptor	Receptor mediating steroid hormone effects.	GR activation reduces inflammation.
G035	GRACE	Global Registry of Acute Coronary Events	Risk score for ACS outcomes.	GRACE score calculated in MI patient.
G036	GRA	Glucocorticoid-Remediable Aldosteronism	Rare cause of familial hypertension.	GRA confirmed by genetic testing.
G037	GSC	Germinal Stem Cell	Stem cells that produce gametes.	GSC research used in fertility treatment.
G038	GSD	Glycogen Storage Disease	Inherited disorder of glycogen metabolism.	GSD type I presents with hypoglycemia.
G039	GSH	Glutathione	Antioxidant protecting cells from damage.	GSH depletion linked with oxidative stress.
G040	GSI	Gamma-Secretase Inhibitor	Drug class for Alzheimer’s research.	GSI trials tested in dementia patients.
G041	GSK	GlaxoSmithKline	Pharmaceutical company.	GSK developed multiple vaccines.
G042	GSV	Great Saphenous Vein	Long vein in leg often used for bypass grafts.	GSV harvested for CABG surgery.
G043	GT	Gene Therapy	Technique to treat genetic disorders.	GT applied in hemophilia trials.
G044	GTA	Granular Tumor of Appendix	Rare appendiceal neoplasm.	GTA found during appendectomy.
G045	GTC	Generalized Tonic-Clonic	Type of seizure with loss of consciousness.	Patient experienced GTC seizure.
G046	GTD	Gestational Trophoblastic Disease	Group of pregnancy-related tumors.	GTD treated with methotrexate.
G047	GTF	General Transcription Factor	Proteins required for transcription initiation.	GTF mutations cause developmental syndromes.
G048	GTN	Glyceryl Trinitrate	Vasodilator for angina.	GTN patch prescribed for stable angina.
G049	GTT	Glucose Tolerance Test	Test for diabetes diagnosis.	2-hour GTT confirms impaired glucose tolerance.
G050	GU	Genitourinary	Pertaining to genital and urinary organs.	GU infection treated with antibiotics.
G051	GUB	Genitourinary Bleeding	Blood from urinary tract.	Hematuria categorized as GUB.
G052	GUE	Genitourinary Examination	Clinical exam of GU system.	GUE done for pelvic pain evaluation.
G053	GUS	Glucuronidation System	Pathway for detoxification in liver.	GUS tested in drug metabolism research.
G054	GXT	Graded Exercise Test	Stress test to assess cardiac function.	GXT ordered in chest pain evaluation.
G055	GYN	Gynecology	Medical specialty for female reproductive health.	GYN consult for ovarian cyst.
G056	GABA-A	Gamma-Aminobutyric Acid A Receptor	Major receptor subtype for inhibitory neurotransmission.	GABA-A targeted by sedative drugs.
G057	GABA-B	Gamma-Aminobutyric Acid B Receptor	GPCR subtype of GABA receptor.	Baclofen acts on GABA-B receptor.
G058	GAT	Glutamic Acid Transporter	Protein moving glutamate across membranes.	GAT dysfunction linked to epilepsy.
G059	GCK	Glucokinase	Enzyme regulating glucose metabolism.	GCK mutations cause MODY-2 diabetes.
G060	GCP	Good Clinical Practice	Guidelines for clinical trials.	GCP standards followed in drug research.
G061	G-CSF	Granulocyte Colony Stimulating Factor	Stimulates neutrophil production.	G-CSF given in neutropenic fever.
G062	GFR	Glomerular Filtration Rate	Estimate of kidney function.	GFR <60 mL/min indicates CKD.
G063	GGT	Gamma-Glutamyl Transferase	Enzyme elevated in liver disease.	GGT used to confirm alcoholic liver injury.
G064	GIP	Gastric Inhibitory Peptide	Incretin hormone stimulating insulin release.	GIP studied in diabetes management.
G065	GIST-1	Gastrointestinal Stromal Tumor 1	Genetic subtype of GIST.	GIST-1 positive patient treated with imatinib.
G066	GM	Gray Matter	Brain tissue with neuronal cell bodies.	MRI showed GM lesions in MS.
G067	GMH	Germinal Matrix Hemorrhage	Bleeding in preterm neonates.	GMH diagnosed on cranial ultrasound.
G068	GMP	Good Manufacturing Practice	Standards for drug/vaccine production.	GMP required in pharma industries.
G069	GNRH	Gonadotropin-Releasing Hormone	Hormone regulating LH and FSH secretion.	GnRH agonists used in prostate cancer.
G070	GORDS	Gastro-Oesophageal Reflux Disorders	Spectrum of reflux-related conditions.	Chronic heartburn falls under GORDS.
G071	GPCR	G Protein-Coupled Receptor	Large receptor family involved in signaling.	GPCR targeted by beta-blockers.
G072	GPi	Globus Pallidus Interna	Brain nucleus in basal ganglia.	GPi stimulation used in Parkinson’s DBS.
G073	GRF	Growth Hormone Releasing Factor	Stimulates GH secretion.	GRF deficiency leads to low GH.
G074	GRH	Gonadotropin-Releasing Hormone	Alternate name of GnRH.	GRH analogs treat endometriosis.
G075	GRP	Gastrin-Releasing Peptide	Gut neuropeptide stimulating gastrin.	GRP levels tested in gastric cancer.
G076	GS	Good Samaritan	Refers to medical aid laws.	GS laws protect bystanders performing CPR.
G077	GSD-1	Glycogen Storage Disease Type I	Von Gierke’s disease subtype.	GSD-1 causes hypoglycemia in infants.
G078	GSD-2	Glycogen Storage Disease Type II	Pompe’s disease subtype.	GSD-2 involves lysosomal enzyme defect.
G079	GSD-3	Glycogen Storage Disease Type III	Cori’s disease subtype.	GSD-3 leads to hepatomegaly.
G080	GSE	Generalized Seizure	Epileptic event involving both hemispheres.	GSE observed in tonic-clonic convulsions.
G081	GSH-Px	Glutathione Peroxidase	Antioxidant enzyme reducing free radicals.	GSH-Px levels measured in oxidative stress.
G082	GSM	Genitourinary Syndrome of Menopause	Atrophy and dryness due to estrogen loss.	GSM treated with topical estrogen.
G083	GSP	Glucocorticoid-Stimulated Protein	Protein regulated by steroid hormones.	GSP studied in immunology.
G084	GST	Glutathione S-Transferase	Detoxification enzyme.	GST polymorphisms studied in cancer risk.
G085	GTCS	Generalized Tonic-Clonic Seizure	Epileptic seizure type.	GTCS treated with antiepileptic drugs.
G086	GTI	Genitourinary Tract Infection	Infection of urinary/reproductive tract.	UTI classified under GTI.
G087	GTP	Guanosine Triphosphate	Nucleotide involved in energy metabolism.	GTP used in protein synthesis.
G088	GTPase	GTP Hydrolyzing Enzyme	Enzyme converting GTP to GDP.	Ras is a GTPase in cancer pathways.
G089	GV	Gene Variant	DNA sequence alteration.	GV identified in genetic testing.
G090	GvHD	Graft versus Host Disease	Immune reaction post-transplant.	GvHD prevented with immunosuppressants.
G091	GWAS	Genome-Wide Association Study	Research approach to find genetic links to disease.	GWAS identified T2DM susceptibility genes.
G092	GWI	Gulf War Illness	Chronic condition in veterans.	GWI linked to chemical exposure.
G093	GWL	General Weight Loss	Reduction in body mass.	GWL monitored in cancer patients.
G094	GXT-M	Graded Exercise Test with Myocardial Imaging	Stress test with nuclear scan.	GXT-M used to detect ischemia.
G095	GYN-ONC	Gynecologic Oncology	Specialty for female reproductive cancers.	GYN-ONC managed patient with ovarian carcinoma.
G096	G0	Gap Zero Phase	Resting phase in cell cycle.	G0 cells resistant to chemotherapy.
G097	G1	Gap One Phase	Cell growth before DNA synthesis.	G1 arrest seen with p53 activation.
G098	G2	Gap Two Phase	Pre-mitotic cell cycle phase.	G2 checkpoint prevents damaged DNA replication.
G099	G6PD	Glucose-6-Phosphate Dehydrogenase	Enzyme deficiency causing hemolysis.	G6PD deficiency triggered by fava beans.
G100	G12C	Glycine-to-Cysteine Mutation at Codon 12	KRAS mutation in cancers.	G12C inhibitors tested in lung cancer.

S. No	Acronyms	Full Form	Short Explanation	Practical Example
G101	GA	General Anesthesia	State of unconsciousness induced for surgery.	GA used during open-heart surgery.
G102	GABHS	Group A Beta-Hemolytic Streptococcus	Bacteria causing pharyngitis and rheumatic fever.	Throat swab tested positive for GABHS.
G103	GAD65	Glutamic Acid Decarboxylase 65	Autoantibody marker for type 1 diabetes.	GAD65 antibodies detected in new-onset diabetes.
G104	GAE	Granulomatous Amebic Encephalitis	Rare brain infection caused by amoeba.	GAE diagnosed in immunocompromised patient.
G105	GAM	Gamma Globulin	Group of serum proteins including antibodies.	GAM infusion given for immunodeficiency.
G106	GAMP	Guanosine Monophosphate	Nucleotide involved in metabolism.	GAMP cycle studied in cell signaling.
G107	GAP	Good Agricultural Practice	Standards to ensure safe food production.	GAP followed to reduce pesticide exposure.
G108	GAS	Group A Streptococcus	Bacteria responsible for strep throat.	Penicillin prescribed for GAS pharyngitis.
G109	GBM	Glioblastoma Multiforme	Aggressive primary brain tumor.	GBM treated with surgery and radiation.
G110	GBSN	Guillain-Barré Syndrome Neuropathy	Variant of GBS with sensory loss.	GBSN confirmed on nerve conduction studies.
G111	GCA	Giant Cell Arteritis	Vasculitis of large vessels in elderly.	Temporal artery biopsy confirmed GCA.
G112	GCK-MODY	Glucokinase Maturity-Onset Diabetes of the Young	Genetic diabetes subtype due to GCK mutation.	GCK-MODY managed without insulin.
G113	GCL	Gamma-Glutamyl Cysteine Ligase	Enzyme in glutathione synthesis.	GCL deficiency linked to oxidative damage.
G114	GCNIS	Germ Cell Neoplasia in Situ	Precursor lesion for testicular cancer.	GCNIS found in testicular biopsy.
G115	GCSF	Granulocyte Colony Stimulating Factor	Stimulates neutrophil production.	GCSF given to post-chemo patients.
G116	GCT	Giant Cell Tumor	Locally aggressive bone tumor.	GCT removed surgically from femur.
G117	GD	Graves’ Disease	Autoimmune cause of hyperthyroidism.	GD confirmed by TSH receptor antibodies.
G118	GDI	Global Disability Index	Measure of patient functional status.	GDI assessed in rehabilitation programs.
G119	GDM2	Gestational Diabetes Mellitus Type 2	Advanced form of gestational diabetes.	GDM2 managed with insulin therapy.
G120	GDR	Glucose Disposal Rate	Measure of insulin sensitivity.	GDR calculated in clamp studies.
G121	GDS	Geriatric Depression Scale	Screening tool for elderly depression.	GDS score high in nursing home patient.
G122	GDT	Goal-Directed Therapy	Patient-specific treatment approach.	GDT used in septic shock management.
G123	GE	Gastroenteritis	Inflammation of stomach and intestines.	Viral GE caused diarrhea outbreak.
G124	GEF	Guanine Nucleotide Exchange Factor	Protein regulating GTPase activity.	GEF mutations linked to cancers.
G125	GEL	Gamma-Emitting Lymphocyte	Immune cell type used in research.	GEL levels studied in lymphoma.
G126	GEM	Gemcitabine	Chemotherapy drug for solid tumors.	GEM used in pancreatic cancer.
G127	GEO	Granulomatous Eye Orbitopathy	Autoimmune orbital inflammation.	GEO seen in thyroid eye disease.
G128	GEP	Gastroenteropancreatic	Endocrine system involving GI and pancreas.	GEP tumors treated with somatostatin analogs.
G129	GER	Gastroesophageal Reflux	Backflow of acid into esophagus.	GER diagnosed in infants with regurgitation.
G130	GES	Gastric Electrical Stimulation	Device for gastroparesis treatment.	GES implanted for diabetic gastroparesis.
G131	GFD	Gluten-Free Diet	Nutrition plan excluding gluten.	GFD prescribed for celiac disease.
G132	GFRR	Glomerular Filtration Rate Reserve	Kidney’s capacity to increase GFR.	GFRR tested in renal studies.
G133	GFS	Global Functional Score	Measure of patient’s physical ability.	GFS monitored in rehab clinics.
G134	GGTase	Geranylgeranyl Transferase	Enzyme in protein prenylation.	GGTase inhibitors studied in cancer therapy.
G135	GHB	Gamma-Hydroxybutyrate	Neurotransmitter and drug of abuse.	GHB intoxication treated in ER.
G136	GHP	General Health Profile	Tool for patient wellness assessment.	GHP surveys used in chronic illness.
G137	GHT	Growth Hormone Therapy	Treatment for GH deficiency.	GHT initiated in child with stunted growth.
G138	GIARD	Giardiasis	Intestinal infection by Giardia parasite.	GIARD confirmed on stool microscopy.
G139	GIPR	Gastric Inhibitory Polypeptide Receptor	Receptor for incretin hormone GIP.	GIPR studied in diabetes therapies.
G140	GIS	Geographic Information System	Mapping tool for health epidemiology.	GIS used to track malaria spread.
G141	GIST-2	Gastrointestinal Stromal Tumor Type 2	Genetic subtype of GIST tumors.	GIST-2 mutation treated with targeted therapy.
G142	GK	Glucokinase	Enzyme regulating glucose levels.	GK mutations cause MODY diabetes.
G143	GLD	Glucocorticoid-Induced Diabetes	Diabetes secondary to steroid therapy.	GLD diagnosed after prednisone use.
G144	GLE	Glecaprevir	Antiviral drug for hepatitis C.	GLE used with pibrentasvir in HCV.
G145	GLN	Glutamine	Amino acid with metabolic role.	GLN supplementation in ICU nutrition.
G146	GLP-2	Glucagon-Like Peptide-2	Hormone regulating intestinal growth.	GLP-2 analogs used in short bowel syndrome.
G147	GLT	Glucose Load Test	Screening for diabetes.	GLT performed before GTT in pregnancy.
G148	GLUC	Glucose	Simple sugar energy source.	GLUC checked in routine labs.
G149	GMFCS	Gross Motor Function Classification System	Scale for cerebral palsy severity.	GMFCS used to classify pediatric CP patients.
G150	GMN	Glomerulonephritis	Inflammation of glomeruli in kidneys.	GMN diagnosed with biopsy.
G151	GMP-140	Granule Membrane Protein 140	Platelet adhesion protein (P-selectin).	GMP-140 studied in thrombosis.
G152	GNAQ	Guanine Nucleotide-Binding Protein Q	Oncogene mutation in uveal melanoma.	GNAQ mutation detected in tumor DNA.
G153	GNAT	G Protein-Activated Transducin	Visual signal transduction protein.	GNAT mutations cause night blindness.
G154	GNC	Glycine-N-Methyltransferase	Enzyme in methylation cycle.	GNC deficiency linked with metabolic disease.
G155	GNF	Gene Network Function	Interconnected role of genes.	GNF studied in cancer genomics.
G156	GNH	Generalized Neural Hyperexcitability	Excessive neuronal activity.	GNH linked to seizure disorders.
G157	GNI	Gross National Income	Economic measure used in health systems.	GNI compared in healthcare funding studies.
G158	GNPase	Guanine Nucleotide Phosphatase	Enzyme in nucleotide metabolism.	GNPase deficiency found in lab analysis.
G159	GNRI	Geriatric Nutritional Risk Index	Tool for malnutrition in elderly.	GNRI calculated in hospitalized seniors.
G160	GO	Glycogenosis	General term for glycogen storage disorders.	GO classified into multiple types.
G161	GOAT	Ghrelin O-Acyltransferase	Enzyme activating ghrelin.	GOAT studied in obesity pathways.
G162	GONAD	Gonadal Development	Growth and function of reproductive organs.	GONAD abnormalities cause infertility.
G163	GORD-P	Gastro-Oesophageal Reflux Disease, Pediatric	GERD subtype in children.	Infant diagnosed with GORD-P.
G164	GP-Antigen	Glycoprotein Antigen	Cell surface immune marker.	GP-Antigen tested in autoimmune disease.
G165	GPC3	Glypican-3	Tumor marker for hepatocellular carcinoma.	Elevated GPC3 suggests liver cancer.
G166	GPHD	Graduate Public Health Degree	Advanced qualification in public health.	GPHD required for epidemiology careers.
G167	GPM	Gastrointestinal Peptide Marker	Hormonal biomarker in gut function.	GPM measured in GI tumor studies.
G168	GPO	Gene Product Output	Protein expressed from gene transcription.	GPO measured in molecular biology.
G169	GPRC	G Protein-Coupled Receptor Class C	Subtype of GPCRs.	GPRC targeted in neurological drug trials.
G170	GPS	Global Positioning System	Tool for health mapping and tracking.	GPS used in ambulance dispatch systems.
G171	GPx	Glutathione Peroxidase	Antioxidant enzyme.	GPx deficiency studied in anemia.
G172	GRACE-ACS	Global Registry of Acute Coronary Events–Acute Coronary Syndrome	Risk stratification tool.	GRACE-ACS score calculated for MI.
G173	GRB2	Growth Factor Receptor-Bound Protein 2	Protein in cellular signaling.	GRB2 mutation linked with cancer.
G174	GRD	Gastroesophageal Reflux Disease	Alternative acronym for GERD.	Patient diagnosed with GRD.
G175	GRE	Gradient Echo	MRI imaging technique.	GRE sequence used in brain hemorrhage imaging.
G176	GRP78	Glucose-Regulated Protein 78	Stress response chaperone protein.	GRP78 upregulated in tumors.
G177	GRS	Genetic Risk Score	Measure of disease susceptibility.	GRS used in cardiovascular risk stratification.
G178	GSAT	General Symptom Assessment Tool	Clinical survey for patient evaluation.	GSAT used in internal medicine clinics.
G179	GSCN	Granulocyte-Specific Colony	Hematopoietic cell precursor.	GSCN measured in hematology studies.
G180	GSD-4	Glycogen Storage Disease Type IV	Andersen’s disease subtype.	GSD-4 leads to liver cirrhosis.
G181	GSD-5	Glycogen Storage Disease Type V	McArdle’s disease subtype.	GSD-5 causes exercise intolerance.
G182	GSD-6	Glycogen Storage Disease Type VI	Hers’ disease subtype.	GSD-6 presents with hepatomegaly.
G183	GSD-7	Glycogen Storage Disease Type VII	Tarui’s disease subtype.	GSD-7 causes hemolytic anemia.
G184	GSD-8	Glycogen Storage Disease Type VIII	Liver phosphorylase kinase deficiency.	GSD-8 causes mild hypoglycemia.
G185	GSHR	Glutathione Reductase	Enzyme recycling glutathione.	GSHR deficiency leads to oxidative stress.
G186	GSK-3	Glycogen Synthase Kinase-3	Enzyme regulating glycogen metabolism.	GSK-3 inhibitors studied in diabetes.
G187	GSMR	Genetic Summary Mendelian Randomization	Genomic analysis tool.	GSMR applied in epidemiology studies.
G188	GSN	Gelsolin	Actin-binding protein.	GSN mutations cause amyloidosis.
G189	GSPN	Greater Splanchnic Nerve	Sympathetic nerve supplying abdominal organs.	GSPN targeted in pain management.
G190	GSTM1	Glutathione S-Transferase Mu 1	Detox enzyme variant.	GSTM1 null genotype linked to cancer risk.
G191	GSTP1	Glutathione S-Transferase Pi 1	Enzyme polymorphism.	GSTP1 polymorphisms affect drug metabolism.
G192	GSTT1	Glutathione S-Transferase Theta 1	Enzyme variant linked with oxidative stress.	GSTT1 deficiency associated with lung cancer.
G193	GTase	Glucosyltransferase	Enzyme in glycosylation.	GTase deficiency affects metabolism.
G194	GTCS-M	Generalized Tonic-Clonic Seizure with Myoclonus	Epilepsy subtype.	GTCS-M observed in juvenile epilepsy.
G195	GTPγS	Guanosine 5′-O-(3-Thiotriphosphate)	Non-hydrolyzable GTP analog.	GTPγS used in research experiments.
G196	GTS	Gilles de la Tourette Syndrome	Neurological disorder with tics.	Patient diagnosed with GTS.
G197	GTT-OGTT	Oral Glucose Tolerance Test	Diabetes diagnostic test.	GTT-OGTT positive in impaired glucose tolerance.
G198	GUCA1A	Guanylate Cyclase Activator 1A	Gene linked with cone dystrophy.	GUCA1A mutation detected in genetic testing.
G199	GUSB	Beta-Glucuronidase	Enzyme involved in lysosomal function.	GUSB deficiency causes Sly syndrome.
G200	GVL	Graft Versus Leukemia	Beneficial immune effect after bone marrow transplant.	GVL effect reduces leukemia relapse.