Moderately severe deficiencies describe blood concentrations between 1 and 20 IU/dL; severe deficiencies yield levels of protein C that are below 1 IU/dL or are undetectable.
As deficiencias moderadamente graves presentan concentracións sanguíneas entre 1 e 20 IU/dL; as deficiencias graves presentan niveis por debaixo de 1 IU/dL ou son indetectables.