Schamroth's window test

Schamroth's window test is a diagnostic test used in cardiology to identify clubbing of the fingers, a physical sign that may accompany a number of different diseases, most notably lung cancer, cystic fibrosis, and heart disease. The test is named after Leo Schamroth, a South African cardiologist who described it.

Procedure

The Schamroth's window test is performed by asking the patient to oppose the dorsal surfaces of the ring fingers of both hands. In a healthy individual, a small diamond-shaped 'window' is formed between the proximal nail folds and the nails. If this window is obliterated, the test is positive and clubbing is present.

Clinical significance

Clubbing is a physical sign characterized by bulbous enlargement of the ends of one or more fingers or toes (distal phalanges). It is often associated with certain types of heart and lung disease, including lung cancer, cystic fibrosis, and congenital heart disease. The Schamroth's window test is a simple and effective method of identifying clubbing.

History

The test is named after Leo Schamroth, a South African cardiologist who described it. Schamroth himself had clubbing, and he reportedly used his own hands to demonstrate the sign to medical students.

See also

• Clubbing (medical)
• Leo Schamroth

References

Schamroth's window test Resources
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