Final answer:
The health care provider should be alert for infection as a complication of a missed abortion.
Step-by-step explanation:
The health care provider should be alert for complication of a missed abortion is infection as in a missed abortion, the fetus has died but not expelled from the uterus. This can increase the risk of infection as the remaining fetal tissue may become a potential focus for bacterial growth. Infection can lead to symptoms such as fever, pain, and foul-smelling vaginal discharge. Therefore, it is important for the health care provider to monitor for signs of infection and provide appropriate treatment if necessary.