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Evaluating eosin-5-maleimide binding as a diagnostic test for hereditary spherocytosis in newborn infants

Abstract

Objective:

Neonates with undiagnosed hereditary spherocytosis (HS) are at risk for developing hazardous hyperbilirubinemia and anemia. Making an early diagnosis of HS in a neonate can prompt anticipatory guidance to prevent these adverse outcomes. A recent comparison study showed that a relatively new diagnostic test for HS, eosin-5-maleimide (EMA)-flow cytometry, performs better than other available tests in confirming HS. However, reports have not specifically examined the performance of this test among neonates.

Study design:

We compared EMA-flow cytometry from blood samples of healthy control neonates vs samples from neonates suspected of having HS on the basis of severe Coombs-negative jaundice and spherocytes on blood film. The diagnosis of HS was later either confirmed or excluded based on clinical findings and next generation sequencing (NGS) after which we correlated the EMA-flow results with the diagnosis.

Result:

EMA-flow was performed on the blood of 31 neonates; 20 healthy term newborns and 11 who were suspected of having HS. Eight of the 11 were later confirmed positive for HS and one was confirmed positive for hereditary elliptocytosis (HE). All nine had persistently abnormal erythroid morphology, reticulocytosis and anemia, and eight of the nine had relevant mutations discovered using NGS. The other was confirmed positive for HS on the basis that a parent had HS, and the neonate’s spherocytosis, reticulocytosis and anemia persisted. The 20 healthy controls and the 2 in whom HS was initially suspected but later excluded all had EMA-flow results in the range reported in healthy children and adults. In contrast, all nine in whom HS or HE was confirmed had abnormal EMA-flow results consistent with previous reports in older children and adults with HS.

Conclusion:

Although our sample size is small, our findings are consistent with the literature in older children and adults suggesting that EMA-flow cytometric testing performs well in supporting the diagnosis of HS/HE during the early neonatal period.

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Correspondence to R D Christensen.

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Competing interests

Drs. Agarwal, Nussenzveig, Heikal and Liew are employees of ARUP Laboratories, the reference laboratory where the EMA-flow testing is performed. However, none are equity holders in the company and none benefit financially from the test. The other authors (RDC and HMY) have no conflicts of interest to disclose.

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Christensen, R., Agarwal, A., Nussenzveig, R. et al. Evaluating eosin-5-maleimide binding as a diagnostic test for hereditary spherocytosis in newborn infants. J Perinatol 35, 357–361 (2015). https://doi.org/10.1038/jp.2014.202

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