Interpretation of Iron Status

Calculation and Understanding the Values

Transferrin saturation (TSAT) is calculated using the formula: TSAT (%) = (serum iron / TIBC) × 100, according to Praxis Medical Insights 1
Normal TSAT range in adults is typically 20-50%, with values >50% potentially indicating iron overload, as stated by Praxis Medical Insights 1
Transferrin can be converted to TIBC using the formula: TIBC (μmol/L) = Transferrin (g/L) × 25.1, as reported by Praxis Medical Insights 1

The high TSAT of 82% suggests possible iron overload conditions rather than iron deficiency, according to Praxis Medical Insights 1
TSAT reflects iron that is readily available for erythropoiesis, while serum ferritin reflects storage iron, as noted by the American Journal of Kidney Diseases 2, 3
When TSAT is high (>50%), this indicates that a large proportion of transferrin binding sites are occupied by iron, suggesting excess iron, as stated by Praxis Medical Insights 1

Serum ferritin measurement is essential to confirm iron overload, as it is the most specific test for iron status, according to Gut 4 and Praxis Medical Insights 5

Diurnal variation can affect TSAT measurement, with TSAT levels rising in the morning and falling at night, as reported by Praxis Medical Insights 1
Recent meals can increase serum iron concentration, and inflammation and infection can decrease serum iron concentration, as noted by Praxis Medical Insights 1
Recent IV iron administration should not evaluate iron parameters within 4 weeks of infusion, as stated by Praxis Medical Insights 1

If iron overload is confirmed with additional testing, genetic testing for hereditary hemochromatosis should be considered, according to Praxis Medical Insights 1
Evaluate for symptoms of iron overload including fatigue, joint pain, abdominal pain, and skin pigmentation, as recommended by Praxis Medical Insights 1