Final answer:
The chemistry-related indicator of impending delivery is the 'bloody show', when the mucus plug is expelled from the cervix. Urinalysis test strips can also provide chemical indicators about the pregnancy's progress. The presence of meconium in the amniotic fluid is another sign of delivery, though it commonly happens during childbirth.
Step-by-step explanation:
The chemistry test that indicates impending delivery in pregnant women typically involves observing specific signs such as the loss of the mucus plug, also known as the "bloody show." This event signals that labor may start soon. It is not a chemistry test in the traditional sense, but the presence of this sign can be considered a biological marker of labor's approach. During pregnancy, a plug of mucus accumulates in the cervical canal and is expelled 1-2 days before labor begins. Additionally, physicians may use disposable urinalysis test strips to detect various substances in a patient's urine that might indicate different conditions during pregnancy. These strips work on the principle of chemical reactions and the kinetic aspects are significant for accurate readings.
Another relevant sign of impending delivery is when the amniotic sac ruptures during childbirth, which might indicate that the fetus has passed meconium; this is recognizable if the amniotic fluid is stained yellowish or greenish, rather than being clear and watery.