nbme 1 Rh - needusmlehelp

[ArchivalUser]

A newborn is in severe respiratory distress immediately following delivery. She was born at 35 weeks' 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 respirations 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 her 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

[ArchivalUser]

ANSWER IS E

[ArchivalUser]

eeeeeeeeeeeeee

[ArchivalUser]

couldn't it be A since the mother was probably sensitized from her previous abortion and therefore she has Rh pos?

[ArchivalUser]

if mom is Rh - she will stay Rh -, regadless of subsequent pregnancy (this is an Ag found on RBC and will not change just b/c of sensitization..)

[ArchivalUser]

thanks doyoudig. i did not know that.