This add-on measures Iron, Transferrin, and transferrin saturation (TRAS) in your blood. Transferrin saturation reflects the percentage of transferrin (an iron-binding protein) that is actually carrying iron, providing a more precise picture of your body’s iron availability than iron levels alone. Low transferrin saturation may indicate iron deficiency or chronic illness, while high levels may suggest iron overload—even when symptoms are subtle or not yet present.

Read our complete guide to Transferrin Saturation →