Ferritin 350 ng/mL with elevated CRP suggests what interpretation?

Ferritin 350 ng/mL with elevated CRP suggests what interpretation?

• A. Ferritin as an acute-phase reactant; iron stores interpretation affected by inflammation.
• B. Ferritin percentage is a direct measure of ferritin saturation.
• C. Ferritin levels are not influenced by CRP levels.
• D. Ferritin is not helpful in inflammation.

Answer: (B)

Ferritin can act as an acute-phase reactant. When inflammation is present, indicated by an elevated CRP, ferritin levels can rise regardless of the actual amount of stored iron. So a ferritin of 350 ng/mL in the setting of high CRP doesn’t straightforwardly reflect iron stores; it may be elevated because of inflammation rather than true iron sufficiency. To properly assess iron status during inflammation, you’d consider other measures such as transferrin saturation (serum iron/TIBC) and, if needed, correlate ferritin with CRP or repeat testing when the inflammatory response has resolved. The idea that ferritin percentage directly measures ferritin saturation isn’t correct, since ferritin doesn’t have a saturation percentage in the way transferrin does.

Ferritin can act as an acute-phase reactant. When inflammation is present, indicated by an elevated CRP, ferritin levels can rise regardless of the actual amount of stored iron. So a ferritin of 350 ng/mL in the setting of high CRP doesn’t straightforwardly reflect iron stores; it may be elevated because of inflammation rather than true iron sufficiency. To properly assess iron status during inflammation, you’d consider other measures such as transferrin saturation (serum iron/TIBC) and, if needed, correlate ferritin with CRP or repeat testing when the inflammatory response has resolved. The idea that ferritin percentage directly measures ferritin saturation isn’t correct, since ferritin doesn’t have a saturation percentage in the way transferrin does.