Reference intervals of serum cystatin C for determining cystatin C-based glomerular filtration rates in preterm...

Area of Science:

• Neonatology
• Pediatric Nephrology
• Biomarkers in Neonatal Care

Background:

• Assessing renal function in preterm neonates is crucial for monitoring health and development.
• Serum creatinine (Cr) is a commonly used marker, but its accuracy can be limited in this population.
• Cystatin C (CysC) is emerging as a potential alternative biomarker for glomerular filtration rate (GFR) estimation.

Purpose of the Study:

• To establish reference values for serum Cystatin C (CysC) and CysC-based estimated glomerular filtration rate (eGFR) in preterm neonates.
• To compare CysC and CysC-based eGFR with serum creatinine (Cr) and Cr-based eGFR on the 3rd and 30th days of life.
• To evaluate the relationship between CysC levels and gestational age, birth weight, and gender in preterm infants.

Main Methods:

• Prospective study involving 52 preterm neonates (28-34 weeks gestational age).
• Neonates categorized into three groups based on gestational age: 28-29, 30-32, and 33-34 weeks.
• Blood samples collected on the 3rd and 30th postnatal days for CysC and Cr analysis.
• CysC measured using particle-enhanced nephelometric immunoassay.

Main Results:

• On day 3, CysC levels were slightly higher in the youngest preterm group (28-29 weeks) but without statistical significance compared to older groups.
• CysC values demonstrated independence from gestational age, birth weight, and gender (p > 0.05).
• No significant correlation was observed between CysC and Cr on the 3rd day of life (p > 0.05).

Conclusions:

• Serum Cystatin C (CysC) is a potential alternative biomarker for evaluating renal function in preterm neonates.
• CysC appears to be a reliable marker, unaffected by common confounding factors in this population.
• Further research may solidify CysC's role in routine neonatal nephrology practice.