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Research ArticleArticles

The Cohen hair loss classification system

Bernard Cohen
Hair Transplant Forum International November 2009, 19 (6) 195-197; DOI: https://doi.org/10.33589/19.6.0195
Bernard Cohen
Coral Gables, Florida
MD
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  • For correspondence: bcmd@mac.com
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    Figure 1. Eight zones and 3 regions identify the areas of scalp most commonly affected by male pattern balding. The blank 100-cell table is penciled in to become the hair loss Profile. The hair loss Index is entered in the small box. Tumors, scars, irregular patches of loss, etc., may be drawn directly on the topographic illustrations. To receive a free electronic copy of the above Map and Chart, contact the author at bcmd{at}mac.com. Copyright requires signed permission to publish or reproduce this material for sales, advertising, or other commercial purposes.
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    Figure 2. The regions and zones
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    Figure 3. Definitions of hair loss severity
  • Figure 4.
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    Figure 4. The Severity Scale, photographic examples. A: Minimal: much more hair than skin; B: Mild: more hair than skin; C: Moderate: more skin than hair; and D: Severe: much more skin than hair.
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    Figure 5. Instructions for using the classification system
  • Figure 6.
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    Figure 6. For common hair loss patterns: Extend the line across all columns of each zone.
  • Figure 7.
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    Figure 7. Dots indicate the hair-bearing zones for each of the Norwood categories.
  • Figure 8.
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    Figure 8. For less common hair loss patterns, the rules may be modified. Example: In Zone 7, the above patient has more hair in the lateral than occipital area, therefore, the individual columns within the zone may be scored separately. Similar modifications may be applied to other zones when confronted with less common patterns.
  • Figure 9.
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    Figure 9. The Quick Start mode: Extend the line across all columns of each region.
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In this issue

International Society of Hair Restoration Surgery: 19 (6)
Hair Transplant Forum International
Vol. 19, Issue 6
November/December 2009
  • Table of Contents
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The Cohen hair loss classification system
Bernard Cohen
Hair Transplant Forum International Nov 2009, 19 (6) 195-197; DOI: 10.33589/19.6.0195

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The Cohen hair loss classification system
Bernard Cohen
Hair Transplant Forum International Nov 2009, 19 (6) 195-197; DOI: 10.33589/19.6.0195
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Jump to section

  • Article
    • Background
    • Components of the System
    • Instructions
    • Anatomic Orientation Tips
    • Common Hair Loss Patterns
    • Less Common Hair Loss Patterns
    • Quick Start Mode
    • Discussion
    • References
  • Figures & Data
  • Info & Metrics
  • PDF

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  • Notes from the Editor Emeritus, 1999–2001
  • ABHRS President’s Corner
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