A 37-week client is stating she is having severe back pain and is placed on an external monitor. The monitor shows the following fetal and contraction tracing.
How would the nurse document the client's contractions?

Choice A rationale

At 20 weeks gestation, the uterine fundus typically reaches the level of the umbilicus (navel). This standardized landmark is due to the uterus's growth pattern, where it rises out of the pelvis and becomes an abdominal organ. Measuring fundal height from the symphysis pubis to the top of the fundus, it usually correlates with the weeks of gestation ± 2 cm between 18 and 32 weeks, making 20 cm at the umbilicus the expected finding.

Choice B rationale

Two finger-breadths below the umbilicus corresponds to approximately 18 weeks gestation. Before 20 weeks, the fundus is lower in the abdomen as the uterus continues its upward expansion from the pelvic cavity. At this stage, the measurement would be slightly less than 20 cm, indicating a smaller uterine size than expected for a 20-week pregnancy.

Choice C rationale

Halfway between the symphysis pubis and the umbilicus indicates a fundal height consistent with approximately 16 weeks gestation. At this point, the uterus is palpably in the abdomen, but its superior edge is still significantly lower than the umbilicus. This position reflects earlier growth before the rapid ascent to the umbilicus at 20 weeks.

Choice D rationale

Fundal height at the level of the xyphoid process is expected around 36 weeks gestation as the uterus reaches its highest point in the abdomen. This significantly higher position reflects a near-term pregnancy, where the large fetus and uterus displace the abdominal contents superiorly toward the diaphragm, much later than 20 weeks.

Choice A rationale

Green-stained amniotic fluid in a fetus, especially one who is post-term (41 weeks), is highly suggestive of meconium staining. This occurs when the fetus passes its first stool (meconium) in utero. While the meconium is expelled, its presence in the amniotic fluid is often a sign of fetal stress or compromise, which can lead to complications such as meconium aspiration syndrome.

Choice B rationale

Although green or foul-smelling amniotic fluid can indicate intrauterine infection (chorioamnionitis), particularly if accompanied by maternal fever or uterine tenderness, meconium staining is a more common cause in a post-term pregnancy with a breech presentation. Chorioamnionitis involves ascending infection of the membranes and fluid, not solely the color change due to meconium.

Choice C rationale

Neural tube defects, like spina bifida or anencephaly, are congenital structural abnormalities resulting from incomplete closure of the embryonic neural tube. While they can sometimes be associated with oligohydramnios or specific markers, they do not typically cause the amniotic fluid to turn green. Green fluid is a sign of a physiological event, not an anatomical malformation.

Choice D rationale

Meconium passage in utero, resulting in green amniotic fluid, is frequently an indicator of fetal distress or compromise, often due to hypoxia (oxygen deprivation) or umbilical cord compression. The fetus may pass meconium secondary to vagal nerve stimulation from stress. Therefore, the nurse's finding immediately alerts the team that fetal well-being may be acutely threatened, necessitating close monitoring and potential intervention.