List of medical abbreviations: I

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Abbreviation Meaning
131I or I131 iodine-131 (aka radioactive iodine or radioiodine)
IA intra-arterial
IAA insulin autoantibody
IABP intra-aortic balloon pump
IAI intra-amniotic infection
IBC inflammatory breast cancer
IBD inflammatory bowel disease
IBS irritable bowel syndrome
IC ileocecal
immunocompromised
informed consent
intensive care
interstitial cystitis
immune complex
intracardiac
ICD implantable cardioverter-defibrillator
ICDS Integrated Child Development Services Program
ICD-10 International Classification of Diseases, 10th Revision
ICF intracellular fluid
ICG impedance cardiography
ICH intracerebral hemorrhage
ICM ischemic cardiomyopathy
ICP intracranial pressure
ICS intercostal space
inhaled corticosteroids
internal carotid stenosis
ICSI intracytoplasmic sperm injection
ICU intensive care unit
ICCU intensive cardiac care unit
ID infectious disease
identifying data
I&D incision and drainage (how to treat an abscess)
IDA iron deficiency anemia
IDC idiopathic dilated cardiomyopathy
indwelling catheter
infiltrating ductal carcinoma
IDDM insulin-dependent diabetes mellitus (now called diabetes mellitus type 1)
IDL intermediate-density lipoprotein
IDP infectious disease precautions
IE infective endocarditis
IF immunofluorescence
IFG impaired fasting glycaemia
Ig immunoglobulin
IgA immunoglobulin A
IgD immunoglobulin D
IgE immunoglobulin E
IGF insulin-like growth factor
IgG immunoglobulin G
IgM immunoglobulin M
IGT impaired glucose tolerance
IHC immunohistochemistry
IHD ischaemic heart disease
IHSS ideopathic hypertrophic subaortic stenosis (hypertrophic cardiomyopathy)
IIEF International Index of Erectile Function
ILD interstitial lung disease
IM intramuscular
IMA inferior mesenteric artery
IMB intermenstrual bleed (bleeding between periods)
IMI intramuscular injection
IMM intramyometrial
IMN infectious mononucleosis
IMRT intensity-modulated radiotherapy
IMT inflammatory myofibroblastic tumor
intima-media thickness
IMV intermittent mandatory ventilation (see mechanical ventilation)
Inc incomplete
INF(-α/-β/-γ) interferons -α/-β/-γ
INH isoniazid
Inj injection
INR international normalized ratio
Int internal
INT intermittent needle therapy
IO intraosseous infusion
I&O inputs and outputs
intake and outputs
IODM infant of diabetic mother
IOL induction of labor
intraocular lens
IOP intra-orifice pressure
IP interphalangeal joint[disambiguation needed]
IPF idiopathic pulmonary fibrosis
IPG Implantable Pulse Generator
IPH intraparenchymal hemorrhage or intraperitoneal hemorrhage or idiopathic pulmonary hemosiderosis
IPMN Intraductal papillary mucinous neoplasm
IPPB intermittent positive pressure breathing (see mechanical ventilation)
IPPV intermittent positive pressure ventilation (see mechanical ventilation)
IPS intraperitoneal sounds
IQ intelligence quotient
IR insulin resistance
IRDS infant respiratory distress syndrome
IRIDA inherited iron-refractory iron deficiency anemia
IRIS Immune reconstitution inflammatory syndrome
IS Incentive Spirometry
ISA intrinsic sympathomimetic activity
ISDN isosorbide dinitrate
ISH isolated systolic hypertension
ISMN isosorbide mononitrate
ISQ no change (from Latin, in status quo)
IT immature teratoma
intrathecal
ITP idiopathic thrombocytopenic purpura
immune-mediated thrombocytopenic purpura
ITU intensive treatment unit (or intensive therapy unit)
IUCD intrauterine contraceptive device
IU international units
IUD intrauterine death—sometimes confused with intrauterine contraceptive device—use FDIU or IUFD instead.
intrauterine device—sometimes confused with intrauterine death—use IUCD instead (intrauterine contraceptive device)
IUFD intrauterine foetal demise
IUGR intrauterine growth restriction
IUI intrauterine insemination
IUP intrauterine pregnancy
IUPC intrauterine pressure catheter
IUS intrauterine system
IUT intrauterine transfusion
IV intravenous
IVC inferior vena cava
IVD Intervertebral disc
IV-DSA intravenous digital subtraction angiography
IVDU intravenous drug user
IVF in vitro fertilization;
intravenous fluids
IVH interventricular hemorrhage
IVP intravenous pyelogram
IVPB intravenous piggyback (i.v. short-term infusion)
IVU intravenous urogram
IVUS intravascular ultrasound
Ix Investigation(s)