Serum creatinine and BUN are tests for which organ's function?

Serum creatinine and blood urea nitrogen (BUN) are tests primarily used to assess kidney function. Creatinine is a waste product produced from muscle metabolism and is excreted by the kidneys. Elevated levels of creatinine in the blood typically indicate that the kidneys are not functioning properly, as they are not effectively filtering out waste. Similarly, BUN measures the amount of urea nitrogen in the blood, a byproduct of protein metabolism that is also eliminated through the kidneys. Increased levels of BUN can suggest impaired kidney function or other conditions affecting the kidneys. Therefore, both tests are essential in evaluating how well the kidneys are working and diagnosing potential kidney-related issues.