Digit ratio (2D:4D) and fractional exhaled nitric oxide (FeNO)

Key Points

• Higher digit ratio correlates with elevated levels of fractional exhaled nitric oxide, indicating a possible biomarker relationship.
• Average FeNO levels were significantly different across various digit ratios measured in 150 individuals.
• Measurements evaluated include digit ratio (2D:4D) and FeNO testing in an observational analysis setting.
• Further research is needed to determine the clinical significance and underlying mechanisms of this relationship.