Check Ferritin
Ferritin < 30 mcg/L
Iron Deficiency
Repeat ferritin in 3 months
Ferritin ≥ 30 mcg/L
No
Is there concomitant inflammation?
Yes
Obtain iron studies in the fasting state
Transferrin saturation <20%
Repeat iron studies in 3 months
Ferritin < 20 mcg/L
Ferritin ≥ 20 mcg/L but < 50 mcg/L
Obtain iron studies in the fasting state and consider CRP