A creatinine test is typically used to evaluate kidney function. Here are some of the key reasons why a creatinine test might be ordered:

1. Assess Kidney Function: Creatinine is a waste product produced by muscles from the breakdown of a compound called creatine. Normally, it is filtered out of the blood by the kidneys and excreted in urine. Measuring creatinine levels in the blood and urine can provide important information about how well the kidneys are working.

2. Diagnose Kidney Disease: Elevated levels of creatinine in the blood can indicate impaired kidney function or kidney disease. The test can help diagnose conditions such as chronic kidney disease (CKD), acute kidney injury (AKI), and other kidney disorders.

3. Monitor Kidney Disease Progression: For individuals already diagnosed with kidney disease, regular creatinine tests can help monitor the progression of the disease and the effectiveness of treatments.

4. Evaluate Treatment for Kidney Conditions: If you are undergoing treatment for kidney disease or other conditions affecting the kidneys, a creatinine test can help assess how well the treatment is working.

5. Check for Kidney Damage in High-Risk Individuals: People with conditions such as diabetes, hypertension, and those taking certain medications that can affect the kidneys may need regular creatinine tests to monitor for potential kidney damage.

6. Pre-Surgical Evaluation: Before undergoing certain types of surgery, a creatinine test may be performed to ensure that the kidneys are functioning properly.

7. Part of Routine Health Check-Ups: In some cases, a creatinine test may be included as part of a routine health check-up to assess overall kidney health, especially in older adults or those with risk factors for kidney disease.

By measuring the levels of creatinine in the blood and sometimes in the urine, healthcare providers can gain valuable insights into kidney function and overall health.