Which of the following are common tests ordered for patients with Trisomy 21? (Select all that apply)

Choice A reason: Estrogen level testing is not routinely ordered for Trisomy 21 patients. While fertility concerns may arise in females with Down syndrome, estrogen levels are not a standard screening test. Common tests focus on congenital anomalies and developmental issues, such as cardiac, thyroid, and musculoskeletal abnormalities, making this choice inappropriate. Choice B reason: Vision and hearing screenings are critical for Trisomy 21 patients due to a high prevalence of sensory impairments. Approximately 50% have hearing loss, often conductive, and 60-75% have vision issues like cataracts or refractive errors. Early detection ensures interventions to support development, making this a standard and necessary test. Choice C reason: Spine radiographs are commonly ordered for Trisomy 21 patients to assess for scoliosis and atlantoaxial instability, which occur in about 10-15% of individuals. These musculoskeletal abnormalities can lead to neurological complications if undetected. Regular screening ensures timely intervention, making this a standard test for managing Down syndrome complications. Choice D reason: Echocardiograms are essential for Trisomy 21 patients, as 40-50% have congenital heart defects, such as atrioventricular septal defects or ventricular septal defects. Early detection is critical to manage cardiac complications that can affect growth and survival, making this a routine test in Down syndrome care protocols. Choice E reason: Thyroid hormone level testing is standard for Trisomy 21 patients due to a high risk of hypothyroidism (15-20% prevalence). Thyroid dysfunction can exacerbate developmental delays and metabolic issues. Regular screening ensures early treatment, but it was not selected as one of the three most common tests in this context.