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An Bras Dermatol. 2016 Apr;91(2):156-9. doi: 10.1590/abd1806-4841.20164622.

Are 2D:4D finger-length ratios an indicator of androgenetic alopecia in males?

Author information

1
Selcuk University, Konya, Turkey.

Abstract

BACKGROUND:

Although the pathogenesis of androgenetic alopecia is not completely understood, the roles of genetic susceptibility and androgens are well-known. A lower ratio of the second digit (index finger = 2D) to the fourth digit (ring finger = 4D) length has been hypothesized to reflect prenatal androgen exposure and/or higher sensitivity to androgens.

OBJECTIVES:

To determine the relationship between the second to fourth digit length ratio and androgenetic alopecia.

METHODS:

Finger length measurements were made by a digital vernier calliper. Androgenetic alopecia severity was assessed using the Hamilton-Norwood scale. Subjects with an androgenetic alopecia score of grade III or more were included in the study.

RESULTS:

A total of 189 males with androgenetic alopecia and 171 healthy controls were enrolled in the study. The age range of participants was 19-65 years. The 2D:4D ratios in patients with androgenetic alopecia were significantly lower than those of healthy controls for the right hand; however, no significant difference was found for the left hand. Average 2D:4D ratios in androgenetic alopecia patients were also lower than in controls. No significant relationship was observed between androgenetic alopecia severity and 2D:4D ratios.

CONCLUSION:

Our data support the anatomical evidence of in utero androgen exposure and/or an individual's sensitivity to androgens in patients with androgenetic alopecia. Furthermore, the right hand 2D:4D ratio might be an indicator of androgenetic alopecia development.

PMID:
27192513
PMCID:
PMC4861561
DOI:
10.1590/abd1806-4841.20164622
[Indexed for MEDLINE]
Free PMC Article

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