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Schamroth's sign
System: Chest & Breathing Signs · All chest & breathing signs
What it is — and how it is elicited
Pressing the nails of two opposite fingers together normally leaves a small diamond-shaped window of light; in clubbing the window disappears.
What a positive finding suggests
A bedside test associated with finger clubbing and its underlying causes.
◈ Behind the name
Leo Schamroth (1924–1988), South African cardiologist, who described the test using his own clubbed fingers.
Related signs — Chest & Breathing Signs
Browse the S section of the A–Z list or return to the Clinical Signs hub.
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.