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Hematology of the newborn
.
17
Health Care
Undergraduate 4
06/07/2009

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Cards

Term
What is the normal blood volume in a term infant?
Definition
86 ml/kg
Term
Why do hemoglobin and hematocrit values usually increase in the first several hours after birth?
Definition
Because of movement of plasma from intravascular to extravascular space
Term
In the infant, what is the ratio of capillary value to venous value?
Definition
1.1:1
Term
What is a normal venous hemoglobin for an infant?
Definition
>14 g/dL
Term
In terms of hgb, retic count, and nRBC count, what is the difference between premature infants and term infants?
Definition
In premature infants, hgb is lower, retic count and nRBC counts are higher than term infant
Term
At what age does hgb concentration fall to about 11 g/dL and erythropoiesis begins to increase?
Definition
about 2 months.
Term
What is the normal lifespan of a red blood cell in an infant?
Definition
60 to 80 days
Term
Is it normal to have megaloblastic erythropoiesis in the newborn?
Definition
Yes.
Term
At what age should there no longer be nRBC's present?
Definition
3-5 days.
Term
Is it normal to see immature white cells such as promyelocytes and blast cells in the newborn's blood smear?
Definition
Yes.
Term
How does the infant's platelet count compare to adult platelet count?
Definition
Pretty much the same as adult values
Term
Which has a higher O2 affinity, hgb F or hgb A?
Definition
hgb F
Term
At what age is the O2 dissociation curve about the same as an adult?
Definition
about 6 months old.
Term
At birth, which is more abundant, neutrophils or lymphocytes?
Definition
neutrophils
Term
at 7 days old, which is more abundant, neutrophils or lymphocytes?
Definition
neutrophils
Term
at 2 weeks old, which is more abundant, neutrophils or lymphocytes?
Definition
lymphocytes
Term
between birth and 2 weeks old, does the wbc count increase or decrease?
Definition
decreases
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