What is the normal range for Total Iron Binding Capacity (TIBC)?

What is the normal range for Total Iron Binding Capacity (TIBC)?

• A. 150-250 micrograms/dL
• B. 250-425 micrograms/dL
• C. 425-600 micrograms/dL
• D. 600-800 micrograms/dL

Answer: (B)

Total Iron Binding Capacity (TIBC) is a laboratory test that measures the blood's capacity to bind iron with transferrin, a transport protein. Normal TIBC values are influenced by various factors, including iron status, nutritional status, and overall health.

The correct range for TIBC is 250-425 micrograms/dL. This range reflects typical levels of transferrin saturation and iron transport capacity in healthy individuals. An elevated TIBC can indicate conditions such as iron deficiency anemia, as the body increases the production of transferrin to maximize iron utilization when iron stores are low. In contrast, lower TIBC levels may be seen in various conditions such as anemia of chronic disease or hemochromatosis, where there is sufficient or excess iron in the body.

Therefore, the correct answer provides the normal reference range, helping to establish a basis for interpreting the test results and understanding potential underlying conditions.