Transferrin formula

Transferrin formula

• A. Transferrin (mg/dL) = TIBC × 0.7
• B. Transferrin (mg/dL) = TIBC ÷ 2
• C. Transferrin (mg/dL) = TIBC + 5
• D. Transferrin (mg/dL) = TIBC − 20

Answer: (A)

The key idea is how transferrin concentration relates to TIBC. TIBC reflects the total iron-binding capacity in serum, which essentially comes from the amount of transferrin present and its binding sites. In practice, the transferrin concentration in mg/dL is about two-thirds of the TIBC expressed in μg/dL, so a commonly used conversion is Transferrin mg/dL ≈ TIBC μg/dL × 0.7. This simple factor links the binding capacity to the actual protein amount. For example, if TIBC is 300 μg/dL, the estimated transferrin would be about 210 mg/dL, which fits typical physiological ranges. The other proposed operations (dividing by 2, adding or subtracting a constant) don’t reflect how binding capacity scales with transferrin concentration, so they don’t align with the standard relationship.

The key idea is how transferrin concentration relates to TIBC. TIBC reflects the total iron-binding capacity in serum, which essentially comes from the amount of transferrin present and its binding sites. In practice, the transferrin concentration in mg/dL is about two-thirds of the TIBC expressed in μg/dL, so a commonly used conversion is Transferrin mg/dL ≈ TIBC μg/dL × 0.7. This simple factor links the binding capacity to the actual protein amount. For example, if TIBC is 300 μg/dL, the estimated transferrin would be about 210 mg/dL, which fits typical physiological ranges. The other proposed operations (dividing by 2, adding or subtracting a constant) don’t reflect how binding capacity scales with transferrin concentration, so they don’t align with the standard relationship.