Category: Blood Test
A Serum Creatinine Test is a blood test used to measure the level of creatinine in the blood and evaluate how well the kidneys are functioning. Creatinine is a natural waste product produced by muscles during normal activity. Healthy kidneys filter creatinine from the blood and remove it through urine. When kidney function becomes reduced, creatinine levels may increase because the kidneys are unable to remove waste efficiently.
The Serum Creatinine Test is one of the most important tests for assessing kidney filtration and detecting kidney problems at an early stage. Doctors often use creatinine levels along with other measurements, such as Estimated Glomerular Filtration Rate (eGFR), to determine how effectively the kidneys are working. Abnormal creatinine levels may indicate conditions such as chronic kidney disease (CKD), acute kidney injury, kidney infection, dehydration, urinary blockage, or other kidney-related disorders.
Doctors commonly recommend this test for patients with symptoms such as swelling in the feet or face, changes in urination, fatigue, nausea, weakness, loss of appetite, or back pain. It is also routinely performed for people with diabetes, high blood pressure, heart disease, kidney disease history, or those taking medicines that may affect kidney function.
The test requires a small blood sample collected from a vein in the arm. No major preparation is usually required, although patients should inform their doctor about medications, supplements, and recent intense exercise, as these factors may influence creatinine levels.
Regular monitoring of creatinine helps detect kidney problems early and allows doctors to recommend appropriate treatment. Maintaining good hydration, controlling blood pressure, managing diabetes, and avoiding unnecessary use of kidney-damaging medicines can help protect kidney health.
The Serum Creatinine Test is performed to check kidney function, detect early kidney damage, monitor chronic kidney disease, evaluate kidney health before certain treatments, assess the effect of medications on kidneys, and help calculate eGFR for measuring kidney filtration ability.
No special preparation is usually required for a Serum Creatinine Test. Patients can normally eat and drink before the test. It is recommended to inform the doctor about all medications, supplements, high-protein diets, and recent heavy exercise because these factors may affect creatinine levels.
Men: 0.7–1.3 mg/dL
Women: 0.6–1.1 mg/dL
(Normal ranges may vary slightly depending on the laboratory and patient factors such as age and muscle mass.)