Preparing for a ferritin blood test does not require a special diet, but a few considerations apply. Ferritin is an acute-phase reactant, so inflammation or infection can falsely elevate levels. Ideally, blood draw should be done fasting, though not strictly required. Avoid iron supplements and very iron-rich meals (e.g., liver, red meat) for 24 hours before the test, as they can transiently raise ferritin. Also avoid high-dose vitamin C supplements or juices immediately before, as they enhance iron absorption. If you have known iron overload (hemochromatosis), follow your doctor's specific instructions. The test is a routine blood draw and does not need extensive preparation. Note: ferritin reflects iron stores, not current iron intake; low levels indicate deficiency, high levels may indicate inflammation or overload. Interpretation must be clinical. Evidence: practice guidelines; no RCTs on preparation.
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