ECF (extracellular fluid)

ECG (electrocardiogram)

echo (echocardiogram)

ECL (electrochemiluminescence)

ECLAM (European Consensus Lupus Activity Measure)

ECLS (extracorporeal life support)

ECMO (extracorporeal membrane oxygenation)

ECP (emergency contraceptive pill)

ECQ (executive code qualifications)

ECR (emergency chemical restraints)