Abstract
Abstract Objectives To explore and identify an optimal serum ferritin (SF) threshold level in diagnosing hemophagocytic lymphohistiocytosis (HLH) in Chinese children. Methods We conducted a retrospective study of 74 children with HLH admitted to Guangdong Women and Children Hospital between January 2015 and May 2021. Children in-hospital not diagnosed with HLH between January 2021 and May 2021 with a measurement of SF were enrolled as the non-HLH group. Patient charts were reviewed for SF levels upon admission and during hospitalization. A receiver operating characteristic (ROC) curve was utilized to determine the optimal cutoff value of SF for diagnosing childhood HLH. Results This study included a total of 74 children with HLH and 302 children with non-HLH diseases. The difference in SF values between the HLH and non-HLH groups was statistically significant (8,975 μg/L vs. 165.5 μg/L, p<0.001). An optimal SF cutoff value of 1,830 μg/L provided a sensitivity of 88 % and specificity of 79 % in confirming childhood HLH. The area under the curve (AUC) is 0.91 (95 % confidence interval 0.88–0.94, p<0.0001). Conclusions A serum ferritin level elevated above 1,830 μg/L might improve the specificity for HLH diagnosis in Chinese children.
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