Table 1.

BChE activity in sera from poisoned individuals and from controls

poison	Time between poisoning and blood draw	Days in hospital	BChE activity units/ml	Inhibition of BChE %	Labeled BChE peptide found
dichlorvos	10 hours	11	0.41	84	yes
dichlorvos	9 hours	2	0.50	80	yes
dichlorvos	11 hours	1	2.30	8	no
Aldicarb	7 hours	3	0.07	97	yes
Baygon	22 hours	3	1.96	22	no
Unknown OP	Unknown	Unknown	0.95	62	yes
none	none	none	2.50	0	no

The name of the poison was established from the reports of family members who found bottles of pesticide in the home. The unknown OP was identified in the present work as chlorpyrifos oxon from mass spectrometry of the BChE adduct.