Organophosphate Pesticide Mass Concentration in Urine (e.g., Chlorpyrifos)

This test measures the level of a specific substance or marker in your body, giving your healthcare team important information about how well certain organs and body systems are functioning and whether further evaluation may be needed.

The test looks for chlorpyrifos or other organophosphate compounds in your urine. These chemicals can break down into metabolites detectable in your system shortly after exposure. This is often used in occupational or environmental health assessments.

Your provider may order this test to help diagnose a medical condition, investigate symptoms you have been experiencing, screen for disease before symptoms appear, or monitor how well an ongoing treatment is working over time.

Your healthcare provider may order this test if you’ve had potential exposure to pesticides, work in an industry involving pesticides, or live in an area with known pesticide use. It can also be part of a broader evaluation for poisoning or chemical sensitivity.

During the test, a small sample is collected from your body and sent to a laboratory, where specialized equipment and trained staff analyze it to measure the substances your provider wants to evaluate and report the findings.

Urine is collected and analyzed using advanced techniques like high-performance liquid chromatography (HPLC) or immunoassay. These methods identify and quantify the pesticide metabolites present in your urine.

Before the test, your provider will give you specific instructions, which may include fasting for a certain number of hours, avoiding certain foods or drinks, or temporarily pausing some medications. Follow these directions closely and ask questions if anything is unclear.

No special preparation is usually needed, but you may be asked to avoid certain foods or supplements that could interfere with results. Drink plenty of water to ensure a sufficient urine sample.