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Clinical Signs Beginning With O

8 signs in this guide begin with the letter O. Every name links to a page explaining what the sign is, how it is elicited on examination, what a positive finding is associated with, and — for eponyms — who the sign is named after.

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

SignSystemA positive finding is associated with
Ober's testMuscles, Bones & JointsAssociated with tightness of the iliotibial band and tensor fasciae latae.
Obturator signAbdomen & DigestionAssociated with irritation of the obturator internus muscle, classically by an inflamed pelvic appendix, and also with pelvic abscess.
Oliver's signChest & BreathingAssociated with an aneurysm of the aortic arch sitting close to the trachea.
OnycholysisSkin & NailsAssociated with psoriasis, fungal nail infection, thyroid disease and some medicines and chemicals.
Oppenheim signNeurologyAssociated with corticospinal tract lesions; one of several Babinski-equivalent responses.
Ortolani testMuscles, Bones & JointsAssociated with developmental dysplasia of the hip with a reducible dislocation.
Osiander's signPregnancy & Women's HealthAssociated with early pregnancy; one of the older, less-used presumptive signs.
Osler's nodesHeart & CirculationAssociated with infective endocarditis; unlike Janeway lesions, they are tender and are thought to be immune-complex mediated.
Please note: This page is an educational reference about clinical examination signs. A clinical sign supports — and never replaces — a full clinical evaluation, examination and appropriate testing. A sign being present does not by itself prove a diagnosis, and an absent sign does not rule one out. If you have symptoms that worry you, see a health professional.