Ferritin

Ferritin is a biomarker categorized under minerals. It is identified by the short name FER.

Ferritin is tested from a serum sample, and fasting is not required. This means the test can be arranged without preparing for a fasting collection, unless other tests ordered at the same time have separate preparation requirements.

Results are reported in ng/mL. Interpretation uses a reference range and an optimal range, with the optimal range treated as the target for this biomarker. The page also provides separate male and female reference intervals, so the appropriate interval should be used when reviewing a result.

Ferritin may be considered alongside Iron Serum, Tibc, and Transferrin Saturation when reviewing iron-related laboratory findings. These markers are listed as related tests rather than replacements for the ferritin measurement. A clinician can help interpret the result in the context of the applicable reference interval and any other tests obtained during the same assessment.

Ferritin results should be read against the reference range printed on the same laboratory report, including its units. A number by itself has no reliable meaning outside that context, because reports may present different reference ranges or units. The relevant range can also depend on whether a general, male, or female reference range is being used.

The reference range represents the broader interval used for interpretation, while the optimal range is a narrower interval within which the result is considered most favorable. Being inside the reference range does not necessarily mean the result is inside the optimal range, and being outside an optimal range is not automatically the same as being outside the reference range.

A single Ferritin value is not a diagnosis. Results should be considered alongside the reason for testing and other clinical information. An out-of-range result belongs with a clinician, who can interpret it in context and determine whether any further evaluation is appropriate.

Ferritin is best interpreted against its optimal range: a rise is not automatically better, and a fall is not automatically worse. The direction that matters depends on where the starting value sits relative to that range.

Among interventions measured directly, Iron increased ferritin, while Chlorella also increased it in animal studies. Quercetin, Flaxseed Oil, and Resveratrol decreased ferritin in the studies that measured it. Curcumin, Cranberry Extract, and Milk Thistle (Silymarin) did not show a consistent change or significant effect in their direct assessments. These findings are not equally informative: the direct evidence includes different study designs, populations, and levels of consistency, so movement should be considered alongside the strength and limitations of the evidence for each intervention. Across direct studies, ferritin was generally rechecked after 1.4 to 36.0 weeks.

A separate group targets related effects rather than ferritin itself. Nutrient Deficiency Replenishment approaches, including Spirulina, Saccharomyces Boulardii, Whey Protein, Vitamin E, L-Carnitine, and Vitamin B1 (Thiamine), address outcomes associated with nutritional status, though trials did not measure ferritin directly. Similarly, Caffeine, TENS / EMS Therapy, Ice Bath / Cold Plunge, Yoga, Tai Chi, and Meditation target fatigue-related outcomes, though trials did not measure ferritin directly. Evidence for these related effects ranges from anecdotal reports and pharmacology references to clinical studies, randomized trials, and meta-analyses; improvement in the related outcome should not be treated as proof that ferritin changed.