We conducted a pilot study to examine the relationship between organophosphate (OP)\nand pyrethroid (PYR) insecticides in blood and their metabolites in urine. A total of 30 pregnant\nwomen were enrolled in the study, and blood and urine was sampled from each subject during a\nregular clinic visit. Two OP and nine PYR insecticides were selected for blood sample analysis, while\nsix OP and five PYR metabolites were analyzed for urine specimens. Both types of samples were\nprocessed and analyzed on gas chromatography-mass spectrometry. For OPs in blood, chlorpyrifos\nhad a higher mean concentration (73.33 microg/L) than terbufos. For PYRs in blood, cypermethrin and\nimiprothrin were the most frequently detected species with the highest mean concentrations (151.25\nand 141.25 microg/L). ..........................
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