title: Clinical and diagnostic comparison of neonatal alloimmune thrombocytopenia to non-immune cases of thrombocytopenia.
abstract: BACKGROUND
  Affected patients with neonatal alloimmune thrombocytopenia (AIT) are often severely thrombocytopenic and, if so, may suffer an intracranial hemorrhage (ICH). This study was undertaken to compare the outcome of cases of AIT to cases of neonatal thrombocytopenia shown not to be AIT and to identify clinical features that would facilitate the diagnosis.
  
  
  METHODS
  Two hundred twenty two cases of neonatal thrombocytopenia for which serologic testing was obtained by the referring physician were accrued for this study from 11 testing laboratories. The relevant clinical information was pursued.
  
  
  RESULTS
  The mean birth platelet count in 110 neonates with AIT was 26,000/mm(3) x 10(9)/L and the rate of ICH was 11% (not all neonates had head sonos). Three criteria distinguished cases of AIT from other causes of neonatal thrombocytopenia (n = 56): (1) severe thrombocytopenia <50,000/mm(3) x 10(9)/L; (2) ICH associated with 1 or more of: a 1-min Apgar score >5, birthweight >2,200 g, grade >1, antenatal occurrence, or signs of bleeding, that is, petechiae, ecchymoses; and (3) no additional, non-hemorrhagic neonatal medical problems.
  
  
  CONCLUSIONS
  AIT is a unique type of neonatal thrombocytopenia with significant hemorrhagic consequences. Identification of AIT at the bedside should guide institution of appropriate treatment and lead to serologic testing for confirmation.
authors.affiliation: Department of Pediatrics, The New York Hospital, Cornell University Medical Center, New York, New York 10021, USA. jbussel@med.cornell.edu
authors.forename: James B
authors.initials: JB
authors.lastname: Bussel
authors.forename: Stergios
authors.initials: S
authors.lastname: Zacharoulis
authors.forename: Kim
authors.initials: K
authors.lastname: Kramer
authors.forename: Janice G
authors.initials: JG
authors.lastname: McFarland
authors.forename: Joanne
authors.initials: J
authors.lastname: Pauliny
authors.forename: Cecile
authors.initials: C
authors.lastname: Kaplan
mesh_terms: D000465:Algorithms; D016824:Antigens, Human Platelet / Q000276:immunology*; D006801:Humans; D007154:Immune System Diseases / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D007231:Infant, Newborn; D020300:Intracranial Hemorrhages / Q000453:epidemiology; D010976:Platelet Count; D017713:Platelet Transfusion; D013921:Thrombocytopenia / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D016896:Treatment Outcome
chemical_list: D016824:Antigens, Human Platelet