Estimation of Time Since Death Using Biochemical Markers in Synovial Fluid

In the field of forensic medicine, estimating time since death plays an important role in helping the investigative organizations unravel the mystery of crime. Presently, many less reliable subjective parameters are being used to measure it, necessitating the need to have more specific and objective parameters. This cross-sectional comparative study was conducted at the Department of Forensic Medicine and Toxicology, All India Institute of Medical Sciences, Bhopal, India on 60 deceased bodies to determine the correlation between known time since death and biochemical parameters in the synovial fluid specifically sodium, potassium, lactate, and total proteins, analyzed using random access fully automated chemical analyzer (Beckman Coulter Au680) followed by estimation of correlation using Spearman correlation test.All the biochemical parameters that were tested in the synovial fluid except for sodium showed a significant correlation. The potassium and lactate showed a significant positive correlation ( P < 0.001), and on the contrary, the total protein level showed a significant negative correlation with time since death ( P < 0.001). This study shows usefulness of these markers in estimating the time since death. The smaller sample size and the unavailability of the results of effect of cold storage on these parameters necessitate the need of further similar studies to uncover the real practical application.