Impact of processing methods on urinary biomarkers analysis in neonates

Area of Science:

• Neonatal research
• Biomarker analysis
• Clinical trials

Background:

• Diagnosing acute kidney injury in neonates relies on validating urinary biomarkers.
• Neonatal urinary sample collection, storage, and processing present unique challenges.
• Optimizing sample processing is crucial for reliable neonatal clinical trials.

Purpose of the Study:

• To evaluate the necessity of centrifugation for indirectly collected neonatal urine samples.
• To determine if sample processing affects urinary biomarker concentrations in neonates.

Main Methods:

• Urine samples were indirectly collected from 19 neonatal intensive care unit patients.
• Fourteen urinary biomarkers were measured using electrochemiluminescence.
• Paired samples were compared: one set centrifuged before storage, the other before analysis.

Main Results:

• No significant difference in biomarker concentrations was found between centrifugation methods.
• 86% of biomarkers showed less than 2% difference; all were within 4%.
• Percentage error analysis confirmed no difference, with errors below immunoassay variance.

Conclusions:

• Indirectly collected neonatal urine samples do not require pre-storage centrifugation.
• Routine urine collection and storage methods are suitable for quantitative immunoassay analysis.
• Simplified sample processing will facilitate neonatal and pediatric studies.