Fig. 1
From: Is canine calprotectin in serum stabile after storage at low temperature?
Stability of canine serum calprotectin concentrations at −80 °C. Instability equation calculation using the least squares adjustment with confidence intervals (dotted lines for the slope). All patient data is also shown. Red line presents the MPD (maximum permissible difference) for serum calprotectin (which was 32.52% at the time). *PD (%) - percentage difference (%)