This article contains a list of commonly used medical abbreviations and acronyms that start with the letter G and may be encountered in medicine and radiology (please keep both the main list and any sublists in alphabetic order).

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 - misc

• G

  • gauge

  • gauss (cgs unit of magnetic flux density)

  • giga (SI prefix for 10⁹)

  • glycine (single letter amino acid code)

  • gramme (gram is the preferred modern usage)

  • guanine (DNA nucleotide)

• GA

  • gastric analysis

  • general anesthesia

  • gestational age

• Ga: gallium

• GABA: gamma-aminobutyric acid

• GAD: generalized anxiety disorder

• Gad: gadolinium

• GAE: granulomatous amoebic encephalitis

• GAG: glycosaminoglycan

• GAMP: general anesthesia, manipulation and plaster

• GAVE: gastric antral vascular ectasia

• GB

  • gallbladder

  • gastric band

  • gigabyte

• GBEF: gallbladder ejection fraction

• GBM

  • glioblastoma (previously glioblastoma multiforme) 

  • glomerular basement membrane

• GBq: gigabecquerel

• GBS

  • group B streptococcus

  • Guillain-Barré syndrome

• GCA: giant cell arteritis

• GCA scale: global cortical atrophy scale

• GCKD: glomerulocystic kidney disease

• GCS: Glasgow coma scale

• GCT

  • germ cell tumor

  • giant cell tumor

• GCV: great cardiac vein

• GD

  • Gaucher disease

  • gestational diabetes

• Gd: gadolinium

• GDA: gastroduodenal artery

• GDC: gastric duplication cyst

• GDM: gestational diabetes mellitus

• GE

  • General Electric

  • gradient echo

• Ge: germanium

• GERD: gastroesophageal reflux disease

• GEP-NET: gastroenteropancreatic neuroendocrine tumor

• GFR: glomerular filtration rate

• GG

  • Gastrografin^®

  • ground glass

• GGO: ground glass opacity(ies)

• GGT: gamma-glutamyl transferase

• GH: growth hormone

• GHB: gamma hydroxybutyrate

• GHL: glenohumeral ligament

• GHRH: growth hormone releasing hormone

• GI

  • gastrointestinal

  • glycemic index

• GIF: graphics interchange format

• GIFT: gamete intrafallopian transfer

• GIST: gastrointestinal stromal tumor

• GIT: gastrointestinal tract

• GLF: ground-level fall

• Gln: glutamine

• Glu: glutamic acid

• GLUT: glucose transporter

• Gly: glycine

• GM: grey matter

• GMC: General Medical Council (UK)

• GNB: Gram-negative bacteria

• GnRH: gonadotropin-releasing hormone

• GOC: glandular odontogenic cyst

• GoF: gain of function

• GEJ: gastro-esophageal junction

• GOMER: get out of my emergency room

• GOO: gastric outlet obstruction

• GERD: gastro-esophageal reflux disease

• GP

  • general practice

  • general practitioner

  • globus pallidus

• GPA: granulomatosis with polyangiitis

• GPi: globus pallidus internus

• Gr: Greek

• GRASS: gradient acquisition in steady state

• GRE: gradient echo

• GS

  • gallstone

  • Gilbert syndrome

  • Gram stain

• Gs: gauss

• G&S: group and save

• GSD: gestational sac diameter

• GSV: great saphenous vein

• GSW: gun shot wound

• GTCS: generalized tonic-clonic seizure

• GTDC: gastrointestinal tract duplication cyst

• GTN: glyceryl trinitrate

• GTT

  • drop (Latin: gutta)

  • glucose tolerance test

• GTV: gross target volume

• GU

  • gastric ulcer

  • genitourinary

• GUCH: grown up congenital heart disease

• GUM: genitourinary medicine

• GUT: genitourinary tract

• GVHD: graft versus host disease

• Gy: gray

• GYN: gynecology (North American abbreviation)