<p> To know proper functioning of kidney, serum creatinine is the most commonly used screening test. Serum creatinine is caused by many factors such as Blood Pressure, Blood Sugar, Urea, Uric Acid, Sodium, Potassium, Haemoglobin etc. The regression lines for predicting the different factors by serum creatinine have been obtained in this paper. It is observed that predicted values and observed values are close and they have been tested by chi-square test. Also the Glomerular Filtration Rate (GFR) has been calculated separately.</p>