Final answer:
The best next step for managing multiple gestational age discrepancies is to consult with a perinatologist. Ultrasounds are deemed the safest imaging modality during pregnancy, and the correct order of prenatal development is zygote, embryo, and then fetus. Premature infants may need supplemental oxygen due to underdeveloped lungs.
Step-by-step explanation:
When dealing with multiple discrepancies in gestational age according to UWorld, the best next step would be to consult with a perinatologist for further evaluation. By doing so, one can better assess the situation with expertise in fetal and maternal health. Additional ultrasonography might be indicated based on the perinatologist's assessment but jumping to genetic testing or initiating immediate delivery without further evaluation is not considered a standard first step. It's important to remember that among the imaging studies, ultrasounds are the safest during pregnancy. If the patient's gestational age were clear and the fetus were at term, a discussion regarding safe delivery might take place.
With regards to the correct order of prenatal development, it is zygote, embryo, then fetus. A zygote is the initial cell formed when a new organism is conceived, an embryo is the early developmental stage, and a fetus is a later stage when the features of the baby are more distinct and it is growing in size.
A premature infant may require supplemental oxygen because their lungs might not be fully developed, causing difficulties in getting enough oxygen into their bloodstream. Devin, who is experiencing mild contractions but shows no cervical changes nor loss of the mucus plug, is probably having Braxton Hicks contractions, which are common and not necessarily indicative of the onset of labor.