Chemical pathology is the study of the cause and progress of diseases by using chemistry and other laboratory study. A chemical pathologist uses biochemical data from the study of tissues, cells and fluids from the body to aid in detecting, confirming and monitoring diseases. This specialist can act as a clinical consultant in the diagnosis and treatment of diseases.

Doctor density varies by specialty and location. Washington, D.C. has 1 practicing chemical pathologist in Washington.

According to 2005 Census estimates, Washington, D.C. has a population of 550,521. Of this population, 110,240 are under the age of 18 and 66,591 are at or above the age of 65.