The scale only counts "terminal hair" (pigmented, stiff, usually >5mm) and ignores vellus hair (fine, soft, non-pigmented). Each of the 9 body areas is scored from 0 (no hair) to 4 (frankly virile).
The definition of "abnormal" varies by ethnicity. General threshold is ≥ 8. In East Asian populations, a score ≥ 4 is often considered significant, whereas in Mediterranean or Hispanic populations, higher scores (up to 9 or 10) may be normal.
Wait at least 6 months after starting medical therapy (e.g., Spironolactone or OCPs) to re-evaluate the mFG score, as the hair growth cycle is slow and current terminal hairs must be shed first.
Clinical assessment of body hair growth in women.
Visually scoring hirsutism as a tool for clinical practice.
Ferriman-Gallwey Score
Normal Hair Growth
The modified Ferriman-Gallwey (mFG) score is the gold standard for clinical assessment of hirsutism. A score ≥ 8 (or ≥ 4-6 in some ethnic groups) is considered abnormal.