Brad Reisfeld is a professor of chemical and biological engineering, biomedical engineering, and public health at Colorado State University. Your blood serves numerous roles to maintain your health.

If a medical test result is inconclusive, the sample did not provide enough information to confirm a positive or negative result. A person may need another test. People can have various medical tests ...

Urine tests measure specific substances in your urine, such as electrolytes, proteins, and bacteria. These tests can reveal a lot about your health, particularly when gradual changes or big jumps ...

Professor of Chemical and Biological Engineering, Biomedical Engineering, and Public Health, Colorado State University Your blood serves numerous roles to maintain your health. To carry out these ...

In medicine, a person’s blood-test results are compared with the average range in a population. But results are highly individual and tightly regulated around a person’s own stable values. Changes to ...