Final answer:
At the 16-week check-up during pregnancy, the key activity is the measurement of fundal height to evaluate fetal growth. An ultrasound might also be performed to assess development and possibly determine fetal sex, though the primary focus is on identifying any abnormalities. Activities like the glucose tolerance test and amniocentesis are usually conducted at other stages in pregnancy.
Step-by-step explanation:
During a 16-week check-up in pregnancy, various assessments are conducted to monitor the health of the fetus and the pregnant individual. One common procedure done at this stage is measurement of fundal height, which helps in assessing the fetus' growth and development. This is done by measuring the distance from the pubic bone to the top of the uterus. Around this time, an ultrasound might also be performed; while this can determine fetal sex, its more critical functions include assessing fetal development and anatomy for any abnormalities.
Other options such as the glucose tolerance test and amniocentesis are typically conducted later in pregnancy. The glucose tolerance test is commonly done around 24 to 28 weeks of gestation to screen for gestational diabetes, and amniocentesis is usually performed between 15 and 20 weeks, primarily for genetic testing.
Fetal viability is defined as the ability of a fetus to survive outside the womb with medical assistance, which typically occurs after 24 weeks of gestation.