Biomarker Reference · 2:16α ratio
2-Hydroxyestrone : 16α-Hydroxyestrone Ratio (2:16α ratio) is a clinical biomarker used in thyroid-endocrine assessment. This derived ratio expresses the balance between the 2-hydroxylation pathway (considered relatively protective due to weak receptor activity) and the 16α-hydroxylation pathway (more proliferative). It is measured in 2 laboratory tests on BiomarkersLabs.com.
This derived ratio expresses the balance between the 2-hydroxylation pathway (considered relatively protective due to weak receptor activity) and the 16α-hydroxylation pathway (more proliferative). It integrates the activities of CYP1A1/1A2 versus CYP3A4 and their modulation by diet, lifestyle, and genetics.
The 2:16α ratio is the most studied of the oestrogen-metabolite ratios. Observational studies have associated a higher ratio with lower breast cancer risk, and dietary interventions (cruciferous vegetables, flaxseed) have been shown to shift the ratio upward. However, the ratio has not been validated as a standalone diagnostic or prognostic biomarker, so it is used as part of a broader metabolic and risk assessment.
Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.
2 tests on BiomarkersLabs.com include this biomarker.
2-Hydroxyestrone : 16α-Hydroxyestrone Ratio reference range in this test: Functional practitioners often cite >2.0 as favourable; epidemiological data are mixed.
2-Hydroxyestrone : 16α-Hydroxyestrone Ratio reference range in this test: Typically reported as >2.0 favourable; 1.0–2.0 intermediate; <1.0 unfavourable. Interpretive framework is method- and context-dependent.
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