Is SHBG useful for Allergie?

The question of whether SHBG (sex hormone-binding globulin) is useful for allergies cannot be answered with a clear 'yes' based on current evidence. SHBG is primarily a carrier protein for sex steroids and a well-established marker for insulin resistance and metabolic syndrome. Some observational studies have reported inverse associations between SHBG levels and asthma or atopic dermatitis, suggesting a potential link via immune modulation. However, the evidence is inconsistent and insufficient to recommend SHBG as a clinically useful biomarker for allergies. Effect sizes are modest, and no prospective trials have validated SHBG for allergy diagnosis or management. SHBG levels are influenced by numerous confounders (age, sex, BMI, liver function, thyroid status), making interpretation challenging. For allergy assessment, specific IgE, skin prick tests, and clinical history remain the gold standard. Routine SHBG testing for allergy suspicion is not indicated. Caveat: individuals with metabolic risk factors may have low SHBG, but this is not an allergy marker. Evidence: human-moderate (associative studies), but not practice-ready.