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USMLE Step 2 CK Forum USMLE Step 2 CK Discussion Forum: Let's talk about anything related to USMLE Step 2 CK exam


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  #1  
Old 05-19-2013
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A newborn is in severe respiratory distress immediately following delivery .she was born at 35 week gestation to a 35 year-old woman , gravida 2,para 1, aborta 1, who did not receive prenatal care. the newborn's pulse is 60/min and respiratory are irregular and labored . examination shows pallor with perioral cyanosis ,anasarca hepatosplenomegaly .and scattered petechiae .cord blood hemoglobin is 4 g/dl, and reticulocyte count is 18%.A direct antiglobulin ( coombs)test is positive ,which of the following sets of blood groups is most likely in the mother and the newborn ?

Mother------------- Newborn
A) A rh positive -------------O rh positive
B) A rh positive--------------O rh negative
C) A rh negative-------------O rh negative
D) O rh positive--------------O rh negative
E) O rh negative--------------O rh positive


this was taken from NMBE 1 .............i dont have the answer
thanks .
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  #2  
Old 05-19-2013
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E is the true one
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Brainiac (05-21-2013)
  #3  
Old 05-19-2013
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C.........
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  #4  
Old 05-19-2013
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E......as mother is O neg and the baby is O positive, mother has been sensitized in previous pregnancy
A) wrong as Mother has anti B Ab and newborn has both anti B and Anti A antibodies

B) and C wrong as mother has Anti B Ab and newborn has both Anti A and Anti B and since the babys RBCs have no antigens on their surface iso immunization reaction cannot take place
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The above post was thanked by:
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