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Serum procalcitonin (PCT) is a sensitive biomarker used for the diagnosis of infection and sepsis. PCT has also some toxic effects. It is not a proinflammatory stimulus, but may augment the inflammatory processes. High levels of PCT in sepsis may lead to hepatocyte necrosis and, as a result, to liver failure. The pathomechanism of the toxic effect of PCT is still unknown. The influence of liver function on PCT levels has not been studied yet. It is not sure whether the liver dysfunction affects the diagnostic and prognostic value of serum PCT levels. In patients with acute liver failure, the usefulness of PCT-level determination remains controversial. Recent studies have shown a potential diagnostic benefit of PCT as a marker of infection in chronic liver diseases. In both groups there is still no consensus on the optimal cut-off value of PCT levels in order to exclude infection. In patients with liver disease, the serum PCT levels should be interpreted with caution, taking into consideration other factors affecting the PCT threshold.

Procalcitonin in liver dysfunction — Dr Jekyll or Mr Hyde?