The nurse teaches a pregnant woman about the presumptive, probable, and positive signs of pregnancy.
The woman demonstrates understanding of the nurse's instructions if she states that a positive sign of pregnancy is:.

Choice A rationale:

The first dose of the immunization for Measles, mumps, and rubella (MMR) is typically given at the age of 1 year. This timing is in line with the recommendations from organizations like the Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO). Administering the MMR vaccine at this age ensures early protection against these contagious diseases. Delaying the vaccine could put the child at risk, especially considering the highly infectious nature of measles.

Choice B rationale:

Administering the MMR vaccine at 18 months is not in line with the recommended immunization schedule. Waiting until 18 months might expose the child to the risk of contracting these diseases during the gap period, as maternal immunity wanes after the first few months of life.

Choice C rationale:

Administering the MMR vaccine at 2 years is later than the recommended age. Waiting until 2 years could leave the child vulnerable to these diseases during the time between birth and the administration of the vaccine. Early immunization, starting at 1 year, provides essential protection during this critical period.

Choice D rationale:

Waiting until 4 years to administer the MMR vaccine is not in line with the standard immunization schedule. Delaying the vaccine until 4 years of age leaves the child susceptible to these diseases for a more extended period, which is not recommended for preventing outbreaks and ensuring community immunity. The first dose of the immunization for Haemophilus influenzae type B (Hib) is given at the age of 2 months.

Choice A rationale:

Identification of fetal heartbeat (Choice A) is a positive sign of pregnancy. This can be detected using a Doppler device or ultrasound, confirming the presence of a living fetus.

Choice B rationale:

Palpation of fetal outline (Choice B) is another positive sign of pregnancy. Experienced healthcare providers can palpate the fetus through the abdominal wall, feeling its shape and movements.

Choice D rationale:

Verification of fetal movement (Choice D) is also a positive sign of pregnancy. Feeling fetal movements, known as quickening, is an indication of a viable pregnancy.

Choice E rationale:

A positive human chorionic gonadotropin (hCG) test (Choice E) confirms pregnancy. hCG is a hormone produced by the placenta and is present in the blood and urine of pregnant women.

Choice C rationale:

Visualization of the fetus (Choice C) through methods like ultrasound is a positive sign of pregnancy, but it is not typically used for diagnosis in early pregnancy. Palpation of fetal outline and identification of fetal heartbeat are more reliable positive signs.