A pH test determines the degree of acidity or alkalinity of a urine sample. A normal urine specimen has a pH between 5 and 8. Our acceptable pH range runs from 3.0 to 10.9. This expanded range allows for medical conditions and other factors (such as bacterial activity) which may alter the pH of a urine sample without any malicious intent on the part of the donor. Any sample with an abnormal pH outside of our range of 3.0to 10.9 is an adulterated sample, meaning something has been added to the urine sample after voiding for the purpose of tampering with the drug testing process.

Bleach and ammonia, for example, will produce a basic pH (11 or greater). Lemon juice and vinegar can produce an acidic pH (3 or lower). Specimens with pH values less than 3 or greater than or equal to 11 will be reported as adulterated. A specimen reported as adulterated should be interpreted with the same severity as a positive drug test result.