The colour of post-mortem lividity and control skin of 86 cadavers was measured spectrophotometrically to obtain L * (value), a * (chroma) and b * (hue) values. In addition, left heart blood (n = 58), right heart blood (n = 57) and blood from the femoral vein (n = 21) were measured. Using these data, we analysed the relationship between post-mortem lividity, control skin and blood colours. L * of post-mortem lividity (L * p ) and control skin (L * c ) were strongly correlated (r = 0.64). a * and b * of post-mortem lividity (a * p and b * p ) significantly increased with an increasing post-mortem interval (PMI) but r 2 values were low (0.11 and 0.070, respectively). Predictive equations for post-mortem lividity colour (L * p , a * p and b * p ) were developed using control skin colour (L * c , a * c and b * c ) and autopsy findings for the first time. The predictive equation for L * p explained almost 65% of the observed L * p . We created predictive equations for PMI with and without blood colour values, and the most accurate equation, which did not use blood colour values, made it possible to estimate PMI within ± 10.29 h. Further study of these equations will help us to understand the factors that affect post-mortem lividity colour and increase the accuracy of equations for predicting post-mortem lividity colour and PMI.
All Science Journal Classification (ASJC) codes
- Pathology and Forensic Medicine