Biomarker Reference · 2:16α Ratio
2-Hydroxyestrone : 16α-Hydroxyestrone Ratio (2:16α Ratio) is a clinical biomarker used in female-hormones assessment. This ratio compares the protective, rapidly inactivated 2-pathway with the potent, slowly cleared 16α-pathway. It is measured in 1 laboratory test on BiomarkersLabs.com.
This ratio compares the protective, rapidly inactivated 2-pathway with the potent, slowly cleared 16α-pathway. A higher ratio reflects preferential 2-hydroxylation and has been hypothesised to reduce oestrogenic proliferative drive on breast and endometrial tissue. Diet, body fat, exercise, and genetic polymorphisms all influence the ratio.
The 2:16α ratio gained prominence in the 1990s as a potential breast cancer risk marker; subsequent studies have shown mixed results. Despite the lack of definitive evidence, functional and integrative practitioners continue to use it to guide nutritional and lifestyle interventions aimed at modulating oestrogen metabolism, particularly in patients with strong family history or dense breast tissue.
Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.
1 test on BiomarkersLabs.com include this biomarker.
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