Transferrin Saturation Calculator

Your details

Choose TIBC if your lab report lists total iron-binding capacity. Choose serum transferrin if your report lists the transferrin protein concentration instead.
Reference ranges differ slightly by sex.
Serum iron (Fe) from your lab report.
µg/dL
TIBC is the total capacity of transferrin in your blood to bind iron.
µg/dL
Transferrin Saturation (TSAT)Normal range
33.3%

Percentage of transferrin binding sites occupied by iron

Unsaturated Iron-Binding Capacity (UIBC)200µg/dL
TIBC used in calculation300µg/dL
Serum iron100µg/dL
33.3% %
Iron deficiency<15Normal15-50Iron overload50+

Your transferrin saturation is 33.3%.

  • Your TSAT of 33.3% falls within the normal reference range (15-50%), meaning roughly 33% of your transferrin is carrying iron.
  • In healthy adults, only about one-third of transferrin binding sites are normally occupied.
  • Your unsaturated iron-binding capacity (UIBC) is 200.0 µg/dL, which is the spare capacity left to bind more iron.

Next stepRepeat testing may be useful if you have symptoms of fatigue, pallor, or joint pain. Always interpret TSAT alongside ferritin and a full blood count.

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