① Examination of the patient's vomitus or gastric contents initially extracted during gastric lavage, as well as respiratory secretions can prove the presence of organophosphorus compounds
② Determination of organophosphorus decomposition products in urine can be used as an indicator of exposure to poisons and can help early diagnosis
③ The determination of blood cholinesterase activity, such as the decrease of cholinesterase activity to less than 80% of normal people, has diagnostic significance, and the mild degree of poisoning can be estimated based on this value, which can be used as a reference for medication. The blood cholinesterase activity of patients with mild disease decreased to 70% to 50% of normal people, 50% to 30% in moderate patients, and below 30% in severe patients. Bromothymol blue, which is convenient and suitable for use in rural areas and rescue sites.