Which Newborn Tests Help With Trisomy 18 Comfort Care?

When your family chooses comfort-focused care for your baby with trisomy 18, it is important to know that comfort care is active care. It includes providing warmth, oxygen, feeding support, and medications to relieve any distress. The goal of testing simply shifts from planning intensive interventions to maximizing your baby’s quality of life. The tests recommended after birth are not a one-size-fits-all checklist; instead, testing decisions are highly individualized based on your baby’s clinical needs and your family’s personal goals ^[1][2]. The guiding principle is to perform only tests that might improve your baby’s comfort or help you safely manage symptoms at home, while deferring procedures that add stress without changing your care plan ^[3][4].

How Specific Tests Fit Into Comfort Care

Your care team should use shared decision-making—a collaborative process where doctors explain medical options and you share your family’s values—to decide which evaluations make sense for your baby ^[5][6].

Heart Evaluations (Echocardiography)

Congenital heart conditions are very common in babies with trisomy 18 ^[7][8]. An echocardiogram (an ultrasound of the heart) may be considered if knowing the exact heart anatomy will help keep your baby comfortable. For example, the results could help doctors decide if a medication like a diuretic (water pill) might relieve symptoms of heart failure ^[9]. However, doctors and families must weigh the benefits of these medications against the burden of monitoring they may require. If an echocardiogram would only provide information for a heart surgery that you have already decided against, the test may add unnecessary burden without benefiting your baby ^[10].

Neurologic Assessment and Seizure Testing

Your baby’s medical team will carefully observe them for neurological symptoms. Some babies with trisomy 18 experience seizures, which can sometimes appear as apnea (pauses in breathing) ^[11]. If your baby has unexplained apnea or unusual movements, an EEG (electroencephalogram, a test that records brain waves using sensors on the scalp) can check for seizures ^[11]. An EEG should be considered if confirming seizures would change your baby’s treatment plan. Anti-seizure medications can sometimes help treat epileptic apnea, but their benefits must be weighed against potential side effects like sedation or slowed breathing ^[11].

Structural brain scans like MRIs can often be deferred when the results would not alter goal-concordant care. However, they may be relevant if doctors suspect a specifically treatable issue or if your family has questions about diagnosis and prognosis ^[12].

Feeding and Airway Evaluations

Feeding difficulties and airway issues are common in trisomy 18 ^[13][14]. Evaluation usually begins with low-stress bedside observations of your baby’s breathing, swallowing, and comfort during feeds, though bedside observation cannot always rule out silent aspiration.

If feeding problems arise, doctors may discuss an instrumental swallow study (which evaluates swallowing and aspiration risk) or an airway endoscopy (using a small camera to evaluate the airway anatomy) ^[15]. These should be considered if the results will directly change your care plan. For instance, you might consider tube feeding to improve nutrition or reduce the risk of inhaling milk during oral feeds, though tube feeding does not completely prevent the aspiration of saliva or reflux. Because airway procedures can be physically stressful, the benefits of testing must outweigh the risks and caregiver burden ^[16].

Kidney (Renal) Imaging

A renal ultrasound (imaging of the kidneys and urinary tract) might be considered if your baby has signs of a urinary tract issue or if prenatal abnormalities justify checking the kidney structure ^[17]. An ultrasound shows structure and blockages, but it does not measure kidney function for medication dosing. If doctors need to check kidney function to safely dose comfort medications, they will rely on clinical observation, urine output, and potentially blood or urine tests, which should be done if they align with your goals for care.

Hearing and Vision Testing

Non-invasive newborn hearing screening is generally a low-burden test. Testing can be considered if the results will help you better communicate and bond with your baby, such as using more physical touch if hearing loss is present ^[18]. However, hearing and vision screening can be deferred after discussion with your care team if the testing process would be disruptive or if the results would not affect your interaction or care plans.

Laboratory Monitoring

Routine blood draws, such as checking for hyperbilirubinemia (jaundice or yellowing of the skin) ^[19], should be minimized to avoid causing pain ^[20]. However, serious issues like low blood sugar, infection, or dehydration may not be visibly obvious. Blood tests should be considered whenever doctors have a concern for which the result would guide a treatment that fits your baby’s comfort goals. When possible, doctors can use less-invasive options, such as transcutaneous (through the skin) bilirubin measurements for jaundice.

Minimizing Burden and Re-evaluating the Plan

Involving a pediatric palliative care team can help reduce unnecessary diagnostic procedures, ensuring the focus remains firmly on your baby’s comfort ^[20].

Before you transition home, your care team should help you create a written, clinician-approved home care plan ^[21]. This plan should include specific guidance on what to do for distress, labored breathing, prolonged apnea, choking, or a seizure-like episode. It should clearly outline whom to call at any hour, and which responses fit your comfort-focused goals rather than automatically resulting in an emergency hospital transfer.

Importantly, your choices are never permanently locked in. Your family’s goals or your baby’s clinical condition may change over time ^[22]. You might start with a plan to avoid all testing, but later decide to treat a specific symptom—like using a medication to reduce apnea so your baby can safely travel home ^[23]. You always have the right to revisit testing decisions with your care team at any point to ensure the care provided continues to match what is most important to your family ^[22][21].