The Creatinine Test is taken to evaluate the health of your kidneys by estimating the creatinine levels in your blood. People with diabetes, high blood pressure, autoimmune disorders etc., are at a higher risk of kidney damage. Symptoms like fatigue, swelling of feet, loss of appetite, lower back pain, change in the amount and frequency of urine, nausea, and vomiting can be due to the improper functioning of the kidneys. Individuals can take this test as recommended by the doctor.