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Excessive dietary creatine intake from homemade infant formula can elevate serum creatinine levels. Promptly stopping the formula and providing fluids normalized the infant's kidney function markers.

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Area of Science:

  • Pediatric Nephrology
  • Nutritional Science
  • Clinical Toxicology

Background:

  • Serum creatinine is a common but imperfect marker for kidney function, influenced by diet.
  • Infant formula selection presents numerous options for parents, with standard formulas and breast milk having defined creatine content.
  • Online health information varies in reliability, potentially exposing families to harmful advice regarding infant nutrition.

Observation:

  • A case study involving an infant with elevated serum creatinine but normal cystatin C levels.
  • The infant appeared healthy, with initial concerns potentially masked by other factors.
  • Suspicion arose regarding a homemade formula rich in creatine from ingredients like beef liver and unregulated powders.

Findings:

  • High dietary creatine load from a homemade infant formula was identified as the cause of elevated serum creatinine.
  • The infant's creatinine levels normalized within 12 hours after discontinuing the homemade formula and initiating intravenous fluids.
  • This case demonstrates that creatine intake can significantly impact serum creatinine, mimicking kidney dysfunction.

Implications:

  • Emphasizes the critical need for thorough nutritional assessments in pediatric cases with unexplained lab abnormalities.
  • Highlights the potential dangers of unregulated homemade infant formulas and the importance of evidence-based nutritional guidance.
  • Underscores the necessity of educating parents on safe infant feeding practices and the risks of misinformation.