Female Pattern Hair Loss — Classification Guide

Ludwig, 1977 · Sinclair, 2004 · Olsen (frontal accentuation / "Christmas tree" pattern), 1999–2001

Purpose
Descriptive grading of the pattern and severity of female pattern hair loss (female androgenetic alopecia) using the three published visual classifications, to document baseline and follow-up in a standardised way.
Population
Women (post-pubertal to post-menopausal) with non-scarring, patterned hair thinning. Not for diffuse telogen effluvium or scarring alopecias; exclude these first.
Formula
No calculation: select the description that best matches the patient in each system. Ludwig grades I–III · Sinclair grades 1–5 · Olsen pattern (diffuse central, frontal accentuation or male-pattern distribution).
Severity thresholds
Ludwig I mild · II moderate · III severe (Ludwig 1977). Sinclair 1 = normal, 2–3 = early, 4–5 = advanced (Sinclair 2004). The 2023 international PCOS guideline suggests the Ludwig or Olsen scales when assessing hyperandrogenism.
1️⃣ Ludwig classification (1977)

Three grades of diffuse thinning over the crown with preservation of the frontal hairline (a fringe of 1–3 cm is retained). Derived from 468 women; the most widely used scale in clinical trials.

2️⃣ Sinclair scale (2004)

Five-point photographic scale of the midline part viewed from above; grade 1 is normal and grades 2–5 reflect progressive widening of the part and loss of volume. Useful for self-assessment and change over time.

3️⃣ Olsen — pattern of loss (1999–2001)

Olsen described the distribution of loss in women rather than a grade: the midline part is widest anteriorly, with breach of the frontal hairline, producing a triangular "Christmas tree" pattern (frontal accentuation). Ludwig-type diffuse central loss and Hamilton-type male-pattern loss are the other distributions.

ℹ️ In women with hirsutism, acne or irregular cycles, grade hair loss as part of the hyperandrogenism assessment — see the PCOS diagnostic guide and the modified Ferriman-Gallwey score.
📚 References
  1. Ludwig E. Classification of the types of androgenetic alopecia (common baldness) occurring in the female sex. Br J Dermatol. 1977;97(3):247–54. doi:10.1111/j.1365-2133.1977.tb15179.x
  2. Sinclair R, Jolley D, Mallari R, Magee J. The reliability of horizontally sectioned scalp biopsies in the diagnosis of chronic diffuse telogen hair loss in women. J Am Acad Dermatol. 2004;51(2):189–99.
  3. Olsen EA. The midline part: an important physical clue to the clinical diagnosis of androgenetic alopecia in women. J Am Acad Dermatol. 1999;40(1):106–9. doi:10.1016/S0190-9622(99)70539-6
  4. Olsen EA. Female pattern hair loss. J Am Acad Dermatol. 2001;45(3 Suppl):S70–80. doi:10.1067/mjd.2001.117426
  5. Kanti V, Messenger A, Dobos G, et al. Evidence-based (S3) guideline for the treatment of androgenetic alopecia in women and in men — short version. J Eur Acad Dermatol Venereol. 2018;32(1):11–22. doi:10.1111/jdv.14624
  6. Teede HJ, Tay CT, Laven JJE, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. J Clin Endocrinol Metab. 2023;108(10):2447–69. doi:10.1210/clinem/dgad463
Clinical decision support only. This tool is intended to assist clinical assessment and does not replace professional judgment. Always interpret results in the context of the individual patient.