Umbilical Cord Blood Cultures Show Promise in Early Sepsis Detection, Study Finds
Table of Contents
A new retrospective analysis suggests that umbilical cord blood cultures (UCBC) offer a reliable and low-contamination alternative – or valuable addition – to traditional neonatal blood cultures (NBC) in the diagnosis of early-onset sepsis (EONS) in late preterm and term infants.
A growing concern in neonatal care is the accurate and timely diagnosis of EONS, a potentially life-threatening infection occurring in newborns. Current diagnostic methods often rely on blood cultures, but these can be prone to contamination, leading to unnecessary antibiotic use. This new research, conducted on data spanning December 2020 to January 2025, offers a potential pathway to improve diagnostic accuracy and reduce antibiotic exposure.
Evaluating Diagnostic Utility of UCBC vs. NBC
The study, a retrospective analysis of 336 infants, directly compared the performance of UCBC and NBC in identifying EONS. Researchers assessed the rates of true-positive cultures, contamination rates, and the incidence of culture-negative sepsis – cases where sepsis is suspected but no pathogen is identified through culture.
“The objective was to determine if UCBC could provide a comparable diagnostic yield to NBC, while potentially minimizing the risk of false positives,” a senior researcher stated.
Similar Positive Rates, Significantly Low Contamination
The results revealed remarkably similar positive culture rates between the two methods. A total of 4 out of 336 UCBCs (1.2%) returned positive results, compared to 3 out of 223 NBCs (1.3%). Importantly, the contamination rates were exceptionally low. UCBC showed two contaminants (0.6%), while NBC had only one (0.45%).
In one notable case, an infant tested positive for E. coli in both UCBC and NBC, highlighting the potential for both methods to confirm infection. Encouragingly, the study found that no infants required prolonged antibiotic treatment due to culture-negative sepsis.
Implications for Neonatal Sepsis Management
The low contamination rate observed in the UCBC cohort is particularly significant. According to the study’s conclusion, the protocol and collection technique employed may serve as a model for other institutions seeking to reduce false-positive results.
While the research acknowledges that a negative UCBC does not definitively rule out sepsis – and vice versa – the combined use of both UCBC and NBC can enhance diagnostic sensitivity. This, in turn, could lead to more targeted antibiotic use, minimizing the risks associated with broad-spectrum antibiotic therapy.
“Obtaining both UCBC and NBC can improve the sensitivity of EONS diagnosis and help minimize prolonged antibiotic use in cases of culture-negative sepsis,” the study authors noted.
UCBC demonstrated a low contamination rate and comparable diagnostic yield to NBC, suggesting it may be considered a reliable alternative or adjunct to NBC in the evaluation and management of EONS. This research offers a promising step toward optimizing neonatal sepsis diagnosis and improving patient outcomes.
