This add-on measures the level of sex hormone-binding globulin (SHBG) in your blood, a protein that binds to sex hormones like testosterone and oestrogen. SHBG helps regulate the amount of active (free) hormones available in the body. Abnormal SHBG levels can affect hormonal balance and may contribute to symptoms such as fatigue, mood changes, irregular periods, or reduced libido—even if signs are subtle or absent.

Read our complete guide to SHBG →