A diagnosis or opinion on treatment from a second doctor, often a hospital specialist.
A consultation which involves the examination of a patient by a surgeon, and the rendering of an opinion by that surgeon, with respect to the need for elective (non-emergency) surgery which has been recommended by another surgeon.
An independent professional review and assessment of a patient done to confirm, add to, or revise the diagnoses and proposed treatments of another medical professional.
A diagnosis and advice from a physician other than the one who made the original diagnosis.