Newborn Screening Test for Metabolic, Hormonal, and Genetic Disorders

The newborn screening test is a simple blood test that checks your baby for serious but rare health conditions, including metabolic, hormonal, and genetic disorders that often do not cause any noticeable symptoms at birth. Early identification through screening helps protect your baby's health before problems develop.

The ABO and Rh group test determines a newborn's blood type. Everyone has an ABO blood type (A, B, AB, or O) and an Rh factor (positive or negative). This test is performed on blood taken from a newborn, usually from the heel or umbilical cord shortly after birth.

This test is done for all newborns because many of the conditions it detects can cause severe health problems, developmental delays, or life-threatening complications if left untreated. When these conditions are found early, treatment can begin right away, often preventing serious illness and allowing babies to grow and develop normally.

This test is important for newborns because it helps doctors: (1) Identify potential blood group incompatibility between the mother and baby, especially Rh factor incompatibility which can cause jaundice or more serious conditions; (2) Determine if the baby is at risk for hemolytic disease of the newborn; (3) Plan appropriate treatment if jaundice develops; (4) Be prepared in case a blood transfusion is needed.

A health care provider will gently prick your baby's heel with a small lancet and collect a few drops of blood onto a special filter paper card. The procedure takes only a few minutes and is usually performed within the first 24 to 48 hours after birth, often while your baby is still in the hospital.

A small blood sample is collected from the baby's heel (heel stick) or from the umbilical cord immediately after birth. This is a common procedure that takes only a few moments. The sample is then sent to the laboratory for testing.

Most newborn screening results are normal, which means no signs of the tested conditions were found. If a result comes back abnormal, it does not necessarily mean your baby has a condition; follow-up testing is needed to confirm or rule out a diagnosis. Your baby's doctor will contact you and explain any next steps.

The test shows two main things: (1) ABO type - whether the baby has A, B, AB, or O blood; (2) Rh factor - whether the blood is Rh-positive or Rh-negative. If a mother is Rh-negative and her baby is Rh-positive, the mother may develop antibodies that could affect future pregnancies. This can be prevented with proper medical treatment.