Table 3.

Why the ferritin cutoff should be 50  ng/mL

• Gastrointestinal absorption of iron returns to baseline at 50  ng/mL 
• Clinical trials show this cutoff is associated with fatigue 
• Biochemical markers of iron deficiency normalize at 50  ng/mL 
• Gastrointestinal absorption of iron returns to baseline at 50  ng/mL 
• Clinical trials show this cutoff is associated with fatigue 
• Biochemical markers of iron deficiency normalize at 50  ng/mL 
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