What Is Creatinine and Why Are Blood Creatinine Levels Checked?

Creatine is a naturally occurring substance in the body. It can also be found in red meat and shellfish. The creatinine test is frequently used to boost exercise performance and muscle mass.

Muscles require creatine to produce energy. Around 95% of it is found in skeletal muscle. Creatine is found in the majority of sports supplements in the United States. A lower creatine level at the beginning of creatine therapy appears to be more beneficial than a higher creatine level at the beginning.

Creatine is often used to improve workout performance and muscle mass. It is also claimed to treat muscular cramps, exhaustion, multiple sclerosis (MS), depression, and various other diseases; however, there is no scientific evidence to back up the majority of these claims.

What exactly is a creatinine test?

This test determines the creatinine in the blood and/or urine. Creatinine is a waste product your muscles produce during normal, everyday exercise. You excrete creatinine in urine because your kidneys filter your blood.

If you have kidney disease, creatinine might build up in your blood and be expelled less in your urine. If your blood and/or urine creatinine levels are higher than usual, this might be a symptom of renal disease.

Each kidney has millions of nephrons, which are tiny blood-filtering units. The nephrons regularly filter blood via glomeruli, small clusters of blood vessels. These structures remove waste, excess water, and other pollutants from the blood. Toxins are accumulated in the bladder and subsequently eliminated by pee.

Creatinine is a chemical that your kidneys ordinarily remove from your body. Doctors use creatinine levels in the blood to assess kidney function. High creatinine levels may suggest that your kidney is damaged and not functioning correctly.

A creatinine test price typically reflects the procedure conducted in conjunction with a basic metabolic panel (BMP), blood urea nitrogen (BUN) test or comprehensive metabolic panel (CMP).

A blood urea nitrogen (BUN) test is performed to assess the function of your kidneys. The urea nitrogen level in the blood is measured to determine this. Urea nitrogen is a waste product produced in the liver when broken down by proteins.

Normally, the kidneys filter out this waste, and urinating excretes it. When the kidneys or liver are injured, BUN levels rise. Too much urea nitrogen in the blood might indicate renal or liver issues.


A creatinine test is performed to determine if your kidneys are functioning correctly. In addition to blood urea nitrogen tests (BUNs), it is commonly ordered as part of a comprehensive metabolic panel (CMP).

A CMP is a collection of tests that offer information on the body’s various organs and systems. A CMP is typically performed as part of a standard examination. Therefore, unless you have an emergency medical issue, you should be able to resume your routine activities after a BUN test.

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If you have a bleeding issue or are taking specific drugs, such as blood thinners, inform your doctor. This might cause you to bleed more than usual throughout the test.

A BUN test can cause the following side effects: bruising around the puncture site, a bruise at the puncture location, and infection at the puncture site due to blood build-up under the skin.

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