Why does the nurse administer vitamin K to the newborn?
a. Vitamin K prevents the synthesis of prothrombin in the liver and must be given by injection.
b. Most mothers have a diet deficient in vitamin K, which results in the newborn being deficient.
c. The supply of vitamin K is inadequate for at least 3 to 4 months, so the newborn must have a supplement.
d. Bacteria that synthesize vitamin K are not present in the newborn's intestinal tract.
ANS: D
Vitamin K is synthesized in the intestine by bacterial flora. Because newborns have a sterile bowel, one injection of vitamin K is administered prophylactically until normal intestinal flora is established.
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