Document Detail

Isoimmunization is unlikely to be the cause of hemolysis in ABO-incompatible but direct antiglobulin test-negative neonates.
MedLine Citation:
PMID:  12093957     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: It is stated that the direct antiglobulin (Coombs') test (DAT) may be negative in ABO hemolytic disease of the newborn. Thus, significant jaundice in neonates who are A-B incompatible with their mothers but DAT test negative is often attributed to isoimmunization and another diagnosis is not sought. We wished to determine the rate of bilirubin production, as an objective measure of hemolysis, in 2 groups of DAT-negative neonates--ABO-compatible and ABO-incompatible--and in DAT-positive ABO-incompatible neonates. METHODS: In consecutive, term, healthy newborns who were admitted to the general care nursery, we measured the level in parts per million (ppm) of end-tidal breath carbon monoxide (CO), corrected for inspired CO (ETCOc), an index of the rate of bilirubin production. We compared the levels in DAT-negative ABO-incompatible neonates with those in ABO-compatible neonates and with the levels in DAT-positive ABO-incompatible neonates. Statistical analysis was performed using 2-sample t and chi(2) tests. RESULTS: There was no significant difference between the mean 12-hour ETCOc levels in DAT-negative ABO-incompatible neonates (n = 60, 2.2 +/- 0.6 ppm) versus DAT-negative ABO-compatible neonates (n = 171, 2.1 +/- 0.6 ppm), although there was a difference between the mean levels in DAT-positive ABO-incompatible neonates (n = 14, 3.4 +/- 1.8 ppm) and the DAT-negative groups. Four DAT-negative ABO-incompatible neonates had elevated ETCOc levels; in 2, we diagnosed a specific hematologic abnormality, namely, glucose-6-phosphate dehydrogenase deficiency in 1 and elliptocytosis in the other. CONCLUSION: In DAT-negative newborns with significant jaundice or increased bilirubin production, even if ABO-incompatible, a cause other than isoimmunization should be sought.
Marguerite Herschel; Theodore Karrison; Ming Wen; Leslie Caldarelli; Beverly Baron
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Pediatrics     Volume:  110     ISSN:  1098-4275     ISO Abbreviation:  Pediatrics     Publication Date:  2002 Jul 
Date Detail:
Created Date:  2002-07-02     Completed Date:  2002-08-28     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0376422     Medline TA:  Pediatrics     Country:  United States    
Other Details:
Languages:  eng     Pagination:  127-30     Citation Subset:  AIM; IM    
Department of Pediatrics, the University of Chicago Pritzker School of Medicine, Chicago, Illinois 60637, USA.
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MeSH Terms
Bilirubin / biosynthesis*
Breath Tests / methods
Carbon Monoxide / analysis
Coombs' Test / statistics & numerical data*
Erythroblastosis, Fetal / diagnosis*,  etiology,  immunology
Infant, Newborn
Jaundice, Neonatal / diagnosis,  immunology,  metabolism
Rh Isoimmunization / complications,  diagnosis*,  immunology
Grant Support
Reg. No./Substance:
630-08-0/Carbon Monoxide; 635-65-4/Bilirubin

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