Final answer:
A CT scan is the diagnostic test used to confirm maxillary and frontal sinusitis. Ultrasounds are the safest imaging study during pregnancy as they do not use electromagnetic radiation. Option C is correct.
Step-by-step explanation:
The diagnostic test used to confirm the diagnosis of maxillary and frontal sinusitis is a CT scan. Computed Tomography (CT) scans provide detailed images of the sinuses and are particularly useful in diagnosing sinusitis.
This imaging technique is preferred because it can show the presence of sinus inflammation, fluid levels, and obstructions with great detail which is key for a definitive diagnosis and for planning possible surgical interventions if necessary.
As a reference to the subject of safety during pregnancy and the use of imaging studies, ultrasounds are considered the safest option. Unlike CT scans, X-rays, or PET scans, ultrasounds do not use electromagnetic radiation.
Instead, they employ high-frequency sound waves to create images, which makes them especially suitable for monitoring pregnant individuals and their unborn babies.