How it works : Family Health Screening Test strips are plastic strips onto which six separate reagent pads are affixed. The strips are intended for testing urine in the home for Nitrate, Protein,Urobilinogen, Blood, Specific Gravity and Bilirubin. The tests can be used to give a general indication of health and helps in the detection of diseases and infections that can effect the kidneys, urinary tract, liver & heart.