Do a urine test.
A urine sample should be taken as soon as possible after suspected exposure. Only elemental and inorganic mercury can be measured with a urine test. Organic mercury does not pass out of the body through urine. The sample should be laboratory tested. A mercury level of 0 to 20 micrograms/L is normal. Levels above 20 micrograms/L must be reported to the appropriate health authorities.