<prompt> Fluid best for postmortem investigation?CSFVitreousSynovial fluidSerum  <response>: Ans. b Vitreous Ref. Reddy FMT 23rdpg. 332.There is a linear relationship between potassium concentration in vitreous and time after death up to 120 hours.Also Know: The component of vitreous humour that is most useful in determining time since deathPotassium Mucopolysacchride maximally present in vitreous humourHyaluronic acid Biological fluids useful for estimating postmortem intervalVitreous humor, CSF blood Biological fluid NOT studied for estimating postmortem intervalUrine 