The Galactose-1 Phosphate Uridyltransferase (GALT) test in red blood cells (RBCs) is a laboratory test used to measure the levels of the GALT enzyme in red blood cells. This enzyme is essential for galactose metabolism, playing a crucial role in converting galactose into glucose. The test is primarily used to diagnose enzyme deficiency conditions, such as galactosemia, which can lead to serious health problems if not properly managed. A blood sample is required, and precise techniques are used to determine enzyme levels. The results are important for guiding appropriate treatment and dietary management for affected individuals.