Your kidneys work around the clock to filter waste, balance fluids, regulate blood pressure, and maintain healthy electrolyte levels. Because they perform so many essential functions, even a small decline in kidney health can affect your overall well-being. Unfortunately, kidney disease often develops gradually and may not cause noticeable symptoms until significant damage has occurred. A renal function test (RFT) is a simple group of blood and urine tests that evaluates how well your kidneys are working. Recognizing the warning signs early can help you seek medical attention before kidney problems become more serious. Here are ten important signs that may indicate it's time to have a renal function test. 1. Persistent Fatigue and Weakness Feeling tired after a busy day is normal, but ongoing fatigue without a clear reason could be a sign of reduced kidney function. Healthy kidneys help produce erythropoietin, a hormone that stimulates red blood cell production. When kidney func...