This test measures the level of creatinine in the blood. Creatinine is a waste product that is made when another chemical, creatine, is broken down to produce energy for the muscles. This waste product is carried by the blood to the kidneys, which filter it from the body into the urine.
This test may be done to see how well your child’s kidneys filter waste from the body. It can help diagnose kidney disease and see how well treatment is working.
Having this test will take just a few minutes. For babies, the heel may be pricked and a small amount of the blood is taken. For children, a small amount of blood is taken from a vein in your child’s arm with a needle. The blood is collected in tubes and sent to a lab.
This blood test may be done with a 24-hour urine test. It is done either right before you start to collect urine or the day you finish collecting urine.
Ask your child’s healthcare provider when and how you will get the result of your child’s test.
Some of the reasons your child’s creatinine blood level may be higher than normal are:
Your child’s creatinine blood level may be lower than normal if he has a disease that causes a loss of muscle tissue, such as myasthenia gravis or muscular dystrophy. It can also be low if your child does not eat enough protein or has lost a lot of weight.
Test results are only one part of a larger picture that takes into account your child’s medical history, physical exam, and current health. Sometimes a test needs to be repeated to check the first result. Talk to your child’s healthcare provider about your child’s result and ask questions, such as: