The serum creatinine test is a key marker for evaluating kidney function, particularly in athletes. Creatinine, a waste product from muscle metabolism, is filtered by the kidneys. High levels can indicate reduced kidney function, but in athletes, elevated creatinine levels may result from increased muscle mass or intense exercise. Therefore, interpreting these results requires considering an athlete’s physical condition and activity level. Regular monitoring of serum creatinine helps athletes and healthcare providers track kidney health and avoid potential complications from overtraining or underlying kidney issues.

C-reactive protein (CRP) is a marker used to assess inflammation in the body, particularly in chronic inflammatory diseases such as rheumatoid arthritis and inflammatory bowel disease. Elevated CRP levels indicate ongoing inflammation, helping doctors monitor disease progression or response to treatment. Normal CRP levels are typically below 10 mg/L, but they can spike during periods of acute inflammation. Regular CRP testing allows for early detection of flares and helps guide treatment adjustments, making it a valuable tool in managing chronic inflammatory conditions.

A ferritin blood test measures the amount of ferritin, a protein that stores iron in your body. This test helps assess your body's iron levels and is crucial for diagnosing conditions related to iron deficiency or overload. Low ferritin levels may indicate iron deficiency anemia, while high levels can point to conditions such as hemochromatosis or chronic inflammation. Understanding ferritin levels is essential for evaluating overall health and managing disorders that affect iron balance, making this test a key diagnostic tool in both routine and specialized care.

The C-peptide test measures the amount of C-peptide in your blood, a substance released alongside insulin. It is essential for distinguishing between type 1 and type 2 diabetes. In type 1 diabetes, C-peptide levels are low or absent because the pancreas produces little or no insulin. In type 2 diabetes, C-peptide levels are typically normal or high due to insulin resistance. By interpreting C-peptide levels, healthcare providers can better understand the type of diabetes a patient has, monitor pancreatic function, and guide treatment plans more effectively.