Final answer:
The percent saturation is calculated using the UIBC and serum iron levels. Adding UIBC (185 µg/dL) to Fe (125 µg/dL) gives us TIBC, which is used to determine the percent saturation of 40%.
Step-by-step explanation:
To calculate the percent saturation, you would use the formula involving the total iron-binding capacity (TIBC):
Percent Saturation = (Serum Iron ÷ TIBC) × 100%
First, calculate the TIBC by adding UIBC (Unbound Iron Binding Capacity) to the serum iron level:
TIBC = UIBC + Fe = 185 + 125 = 310 µg/dL
Next, calculate the percent saturation:
Percent Saturation = (125 µg/dL ÷ 310 µg/dL) × 100% = 40.32%
When rounded to the nearest whole number, you get a percent saturation of 40%, which corresponds to option C.