Ferritin stores iron and releases it when your body needs it. So your ferritin levels are a useful indicator of your body's iron status. Low levels can indicate that you have iron deficiency anaemia.
Total iron binding capacity
A total iron-binding capacity (TIBC) test measures your blood's capacity to bind and transport iron. This can help indicate if you’re deficient in iron.
Transferrin is a protein that transports iron around the body. A transferrin saturation test measures the amount of iron bound to transferrin. This helps check for iron deficiency.
Unsaturated iron binding capacity
Unsaturated iron-binding capacity (UIBC) is the amount of iron binding sites on transferrin (transports iron around your body) that aren't bound to iron. If you’re deficient in iron, your UIBC will be high.