This Simple Finger Test Could Reveal Signs of Lung Cancer and Other Health Conditions

The so-called Schamroth window test helps to identify a rare type of deformity in the fingers and fingernails—known as "digital clubbing" or "finger clubbing"—which people with some heart or lung problems exhibit.
The so-called Schamroth window test helps to identify a rare type of deformity in the fingers and fingernails—known as digital clubbing or finger clubbing—which people with some heart or lung

Biopsy through the skin for lung cancer

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Lung Cancer and Nail Clubbing

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Lung cancer warning as people urged to use 'finger test' to spot early signs - Edinburgh Live

Clubbing of the Fingers or Toes