Supplementary Material for: Procalcitonin for Detecting Culture-Positive Sepsis in Neonates: A Prospective, Multicenter Study

Introduction: It is unclear if serum procalcitonin (PCT) estimated at sepsis suspicion can help detect culture-positive sepsis in neonates. We evaluated the diagnostic performance of PCT in culture-positive sepsis in neonates. Methods: This was a prospective study (February 2016 to September 2020) conducted in four level-3 units in India. We enrolled neonates suspected of sepsis in the first 28 days of life. Neonates with birth weight Results: The mean birth weight (SD) and median gestation (IQR) were 2,113 (727) g and 36 (32–38) weeks, respectively. Of the 1,204 neonates with eligible cultures, 155 (12.9%) had culture-positive sepsis. Most (79.4%) were culture-positive within 72 h of birth. The sensitivity, specificity, and positive and negative likelihood ratios at 2 ng/mL PCT threshold were 52.3% (95% confidence interval: 44.1–60.3), 64.5% (60.7–68.1), 1.47 (1.23–1.76), and 0.74 (0.62–0.88), respectively. Adding PCT to assessing neonates with 12.9% pretest probability of sepsis generated posttest probabilities of 18% and 10% for positive and negative test results, respectively. Conclusion: Serum PCT did not reliably identify culture-positive sepsis in neonates.