Early detection of late onset sepsis (LOS) in ELBW-infants is still a formidable task. We investigated the association between clinical symptoms and late-onset sepsis (LOS) in 83 episodes of suspected LOS in 67 preterm infants. The most marked association between LOS and symptoms of disturbed circulatory regulation, like prolonged capillary refill time and a greater central-peripheral temperature difference (cpTD) > 2 °C, but not blood pressure changes. So we conclude that prolonged capillary refill time and – more impressive – elevated cpTD were the most useful clinical symptoms for detection of LOS in preterm infants. We especially suggest using cpTD as a predictor of LOS. It is a cheap, non-invasive and readily available tool for daily routines.