Creatinine is one of the key indicators in a biochemical blood test that doctors use to assess kidney function. If its level rises, it may indicate various disorders in the body. However, specialists emphasize: a high level alone is not a diagnosis, but a reason for further examination.
What is Creatinine
Creatinine is a metabolic byproduct that is formed in the muscles and excreted from the body by the kidneys. If the kidneys are functioning normally, the substance is effectively removed from the blood. An increase in its level may indicate that kidney function is impaired or that other factors are affecting the body.
Causes Related to Kidney Diseases
Most often, elevated creatinine is associated with kidney problems. Possible causes include:
- kidney stones
- chronic pyelonephritis
- glomerulonephritis
- diabetic nephropathy
- kidney damage due to hypertension and cardiovascular diseases
The level may also rise due to acute kidney injury, which occurs due to dehydration, infections, toxins, or certain medications.
Additionally, the cause may be urine flow obstruction — for example, due to stones in the urinary tract, prostate diseases, or injuries to the urinary system organs.
Causes Not Directly Related to the Kidneys
Sometimes, creatinine levels increase even with normal kidney function. This can occur with:
- large muscle mass (for example, in athletes)
- intense physical exertion before the test
- muscle injuries
- a diet high in protein
- dehydration
- heart failure
- severe blood loss
Influence of Medications
Some medications can impair kidney function and affect creatinine levels. These include:
- non-steroidal anti-inflammatory drugs
- certain antibiotics
- chemotherapy drugs
Symptoms to Watch For
In kidney diseases, elevated creatinine may be accompanied by the following signs:
- increased fatigue
- swelling in the face and legs
- changes in urine output
- cloudy or very light urine
- nausea and reduced appetite
- skin itching
- shortness of breath
- elevated blood pressure
What to Do If Creatinine is Elevated
If the test shows elevated creatinine levels, specialists recommend consulting a doctor — a therapist, urologist, or nephrologist. Additional tests may be prescribed to clarify the causes:
- calculation of glomerular filtration rate (GFR)
- complete blood and urine tests
- ultrasound of the kidneys and bladder
- blood test for urea, electrolytes, and cystatin C
Conclusion
Elevated creatinine is an important signal that may indicate kidney dysfunction or other health issues. Therefore, when there are deviations in test results, it is important not to self-medicate but to undergo a comprehensive examination and receive a specialist's consultation.
