Transferrin saturation (TSAT)
Percent of transferrin bound to iron, from serum iron and TIBC.
Inputs
0 of 2When to use
- Iron deficiency workup, especially in CKD.
Pearls and pitfalls
- Below 20% suggests iron deficiency; above 45% suggests iron overload.
- Ferritin is an acute-phase reactant; interpret together.
Why use
A quick check before IV iron or ESA therapy.
TSAT (%) = serum iron ÷ TIBC × 100