ABCD rule of dermoscopy

Score range	Criteria		Points	Multiply points by factor	FDS* range
0-2	Asymmetry	No asymmetry	0	x 1.3	0-2.6
		Mono-axial asymmetry	1
		Bi-axial asymmetry	2
0-8	Border	No sharp border	0	x 0.1	0-0.8
		One segment with sharp border	1
		Two segments with sharp border	2
		Three segments with sharp border	3
		Four segments with sharp border	4
		Five segments with sharp border	5
		Six segments with sharp border	6
		Seven segments with sharp border	7
		Eight segments with sharp border	8
1-6	Color	White	1	x 0.5	0.5-3
		Red	1
		Light brown	1
		Dark brown	1
		Blue-gray	1
		Black	1
1-5	Dermoscopic structure	Network	1	x 0.5	0.5-2.5
		Aggregated globules	1
		Dots	1
		Structureless areas	1
		Branched streaks	1
FDS range:					1-8.9

* FDS: final dermoscopy score. <4.75 = benign; 4.75 to 5.45 = suspicious; >5.45 = malignant.

Original table modified for this publication. Nachbar F, Stolz W, Merkle T, et al. The ABCD rule of dermatoscopy. High prospective value in the diagnosis of doubtful melanocytic skin lesions. J Am Acad Dermatol 1994; 30:551. Table used with the permission of Elsevier Inc. All rights reserved.

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ABCD rule of dermoscopy