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Hyperferritinaemia is a frequent anomaly, which is admittedly not very specific, but is also of great diagnostic value if the clinician is able to observe a certain number of interpretation rules. Physiologically, ferritin is a protein synthesised mainly by the liver and designed to store iron in the liver, macrophages and erythrocytes. Despite this, pathophysiology tells us that the increase in ferritinemia goes far beyond iron overload to encompass other factors, in particular inflammation, cell lysis and distribution abnormalities. In the vast majority of cases, the cause of hyperferritinaemia can be identified using a global approach that incorporates the ferritinaemia value, the history and the patient’s clinical and biological context, without having to go through the transferrin saturation coefficient and in-depth liver investigations. Recourse to CST, MRI, genetic tests or even liver biopsy is only necessary in rare situations where the most obvious causes cannot be identified. Finally, recent years have seen the arrival of other entities, in particular SARS-COV2 infection, where ferritin has proved to be of great value both diagnostically and prognostically. [ABSTRACT FROM AUTHOR]

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