Daniel et al reported a grading system for onycholysis. The authors are from Jackson, Mississippi, and Bologna, Italy.
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Appearance
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Stage
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separation of 1-2 mm of the distal nail plate from the hyponychium
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Stage I
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separation of the distal third of the nail plate
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Stage II
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separation of the distal two thirds of the nail plate
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Stage III
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separation of the proximal third of the nail plate; separation extending from the proximal nail fold to the distal end of the nail (onychomadesis)
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Stage IV
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disappearing nail bed (with cornification of the nail bed)
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Stage V
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