| Meaning | ||
| E | ecstasy electrolytes Enterococcus epinephrine estradiol estrogen | |
| E1 | estrone | |
| E2 | estradiol | |
| EAC | external acoustic meatus | |
| EACA | epsilon-aminocaproic acid | |
| EAEC | enteroadhesive Escherichia coli | |
| EAF | enteric adherence factor | |
| EAM | external auditory meatus | |
| EB | epidermolysis bullosa | |
| EBRT | external beam radiation therapy | |
| EBL | estimated blood loss (see bleeding) | |
| EBM | evidence-based medicine expressed breast milk | |
| EBT | electron beam tomography | |
| EBV | Epstein–Barr virus | |
| EC | enteric coating | |
| ECC | endocervical curettage | |
| ECD | endocardial cushion defect | |
| ECF | extracellular fluid enteric cytopathic human orphan | |
| ECG | electrocardiogram | |
| ECM | extracellular matrix | |
| ECHO | echocardiogram, | enteric cytopathic human orphan virus |
| ECI | febris e causa ignota (normally written as febris E.C.I.) fever of unknown origin | |
| ECLS | extracorporeal life support | |
| ECMO | extracorporeal membrane oxygenation | |
| ECP | emergency care practitioner | |
| ECT | electroconvulsive therapy | |
| ECTR | endoscopic carpal tunnel release | |
| ED | eating disorder emergency department erectile dysfunction ectodermal dysplasia effective dose emotional distress | |
| EDC | estimated date of confinement (at 40/40 weeks of pregnancy) | |
| EDD | estimated date of delivery (at 40/40 weeks of pregnancy); expected date of delivery estimated date of discharge | |
| EDF | end diastolic flow (describing the flow of blood through the umbilical artery) | |
| EDH | epidural hematoma | |
| EDM | esophageal Doppler monitor | |
| EDRF | endothelium-derived relaxing factor aka nitric oxide | |
| EAC | Ehlers Danlos Syndrome | |
| EDTA | ethylene-diamine-tetraacetic acid | |
| EDS | Ehlers-Danlos syndrome | |
| EDV | end-diastolic volume | |
| EEE | eastern equine encephalitis | |
| EEG | electroencephalogram | |
| EENT | ears, eyes, nose, throat (see otolaryngology) | |
| EEX | electrodiagnosis | |
| EF | ejection fraction | |
| EFM | electronic fetal monitoring, aka external fetal monitoring (cardiotocograph) | |
| EFS | event-free survival | |
| EFW | estimated fetal weight | |
| EGBUS | external genitalia, Bartholin's glands, urethra & Skene's glands | |
| EGD | esophagogastroduodenoscopy | |
| EGF | epidermal growth factor | |
| EGPA | eosinophilic granulomatosis with polyangiitis (formerly known as Churg–Strauss syndrome) | |
| EHEC | enterohemorrhagic Escherichia coli | |
| EIEC | enteroinvasive Escherichia coli | |
| EIA | external iliac artery External iliac artery | |
| EIB | Exercise Induced Bronchospasm | |
| EJ | elbow jerk (triceps reflex) | |
| EKG | electrocardiogram | |
| ELLSCS | elective lower segment caesarean section | |
| ELISA | ||
| EM | erythema multiforme | |
| EMB | ethambutol endometrial biopsy or endomyocardial biopsy | |
| EmBx | endometrial biopsy | |
| EMC | encephalomyocarditis | |
| EMD | early morning discovery electromechanical dissociation | |
| EMDEX | essential medicines index | |
| EMF | endomyocardial fibrosis | |
| EMG | electromyography | |
| EMLSCS | emergency lower segment Caesarean section | |
| EMS | Emergency Medical Service(s) | |
| EMU | early morning urine sample (being the most concentrated, generally used for pregnancy testing) | |
| Emul | emulsion | |
| ENT | ear, nose, and throat (see otolaryngology) | |
| EOB | edge of bed | |
| EoL | End-of-life (adjective) | |
| EoLC | End-of-life care | |
| EOM | extraocular muscles | |
| EOMI | extraocular movements intact (see eye movement) | |
| EPCT | estrogen-progesterone challenge test | |
| EPEC | enteropathogenic Escherichia coli | |
| EPH | edema, proteinuria, hypertension | |
| Epi | epinephrine | |
| EPO | erythropoietin | |
| EPS | electrophysiology extrapyramidal syndromes | |
| EQ | Empathy quotient | |
| ER | emergency room | |
| ERCP | endoscopic retrograde cholangiopancreatography | |
| ERM | epiretinal membrane | |
| ERMS | embryonal rhabdomyosarcoma | |
| ERT | enzyme replacement therapy | |
| ESA | erythropoiesis-stimulating agent | |
| ESHAP | etoposide, cisplatin, cytarabine, methylprednisolone (chemotherapy regimen for relapsed Non-Hodgkin lymphoma) | |
| ESI | epidural steroid injection | |
| ESL | extracorporeal shockwave lithotripsy (also ESWL) (see lithotriptor); English as a second language (affects provider–patient communication) | |
| ESBL | extended spectrum beta-lactamase (see also gram-negative bacteria) | |
| ESM | ejection systolic murmur | |
| ESR | erythrocyte sedimentation rate | |
| ESRF | end-stage renal failure | |
| ESRD | end-stage renal disease | |
| ESS | empty sella syndrome enhanced support service | |
| EST | endodermal sinus tumor | |
| ESV | end-systolic volume | |
| ESWL | extracorporeal shockwave lithotripsy (also ESL) (see lithotriptor) | |
| ET | endothelin endotrachealembryo transfer Essential thrombocythemia | |
| ETEC | enterotoxigenic Escherichia coli | |
| Etiol | etiology | |
| ETOH | ethanol (ethyl alcohol) | |
| ETS | endoscopic thoracic sympathectomy | |
| ETT | endotracheal tube | |
| EUA | examination under anesthesia | |
| EUP | extrauterine pregnancy | |
| EUS | endoscopic ultrasonography | |
| EVA | enlarged vestibular aqueduct | |
| EVAR | endovascular aneurysm repair | |
| EVF | erythrocyte volume fraction (see hematocrit) | |
| Ex-n | previously; used for premature infants that have been born (ex-28 = born at 28 weeks gestation) | |
| Exam | examination (for example, physical examination) | |
| Exp Lap | exploratory laparotomy | |
| Ext | extremities |