ACHE and organophosphate poisoning: Whilst indirect laboratory tests of organophosphate poisoningincluding plasma butyrylcholinesterase (pseudocholinesterase –PCHE) and acetylcholinesterase activity in red blood cells (RCC) arehelpful, the diagnosis of organophosphate poisoning is most oftenmade by a positive history of ingestion or exposure, in addition tothe classic presentation.[3,11] One of the main difficulties in using theselaboratory measurements is that they are not immediately or easilyavailable, and therefore treatment is usually initiated based on clinicaldiagnosis and/or history alone.[3,11]