Newborn Screening Tests
What the standard tests check for and why they matter
Standard Screening Overview
Within the first 24 to 48 hours after birth, the baby will be offered a series of routine screening tests. These tests detect rare but serious conditions that may not be visible at birth. Early detection allows for early treatment, which can prevent lifelong disability or death. The specific tests vary by state, but most screen for at least 30 conditions.
The Heel Stick Blood Test
A small sample of blood is taken from the baby's heel and sent to a lab. This test screens for a range of metabolic, genetic, and endocrine disorders, including phenylketonuria (PKU), congenital hypothyroidism, and sickle cell disease. The test is usually done before the baby leaves the hospital. Results may take several days to return. If a result is abnormal, it does not always mean the baby has the condition, but further testing will be needed.
Hearing Screening
A quick, painless test checks the baby's hearing using soft earphones and sensors placed on the baby's head. The test is done while the baby is sleeping or calm. Early identification of hearing loss is important for language development. Most hospitals perform this screening before discharge.
Critical Congenital Heart Disease Screening
A simple test called pulse oximetry measures the oxygen level in the baby's blood using a small sensor wrapped around the baby's hand or foot. Low oxygen levels can indicate a heart defect that may not be obvious otherwise. Early detection allows for timely intervention.
What You Can Do
Ask your care provider which tests are standard in your state and whether you will receive the results. If the baby is born at home, your midwife will arrange for the screening tests, often at a local lab or clinic. You have the right to decline any test, but screening is strongly recommended for every baby. If a result comes back abnormal, follow up promptly with the recommended specialist.