Normally, Lovibond's angle is less than 165° (marked). The red line shows the outline of a clubbed nail.

Lovibond's angle is the angle between the base of the nail plate and the adjacent skin on the end of the finger. Normally, this angle is less than 165°. If it is 180° or more, there will be a positive Schamroth's window test. This is a sign of clubbing.

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