Despite the generally complex composition and rheology of body fluids, certain rheological measurements can be used to monitor and detect specific physiological states or conditions. This presents an opportunity to develop simple, convenient, and non-invasive tests that provide rapid results and can be performed easily in either a home or a physician's office setting. We will present two examples of viscosity measurements that can be used to monitor the fertile period in women, and to detect cystic fibrosis in newborn infants, and will describe devices designed for consumers or medical practitioners to perform these tests. Both of these tests have advantages compared to current testing methods, which we will discuss. Finally, we will consider some general aspects of rheological testing of fluids in the context of healthcare.