Newborn Screening Blood Test (Heel Stick)

This test is a simple blood screening done shortly after birth to check your baby for serious but rare health conditions that often cause no noticeable signs in the first days of life. Finding these conditions early means treatment can begin right away, which helps protect your baby's growth, development, and long-term health.

The ABO and Rh blood type test is a simple blood test that determines two important things about your baby's blood: (1) the ABO blood group (A, B, AB, or O) and (2) the Rh factor (Rh-positive or Rh-negative). This test is performed specifically during infancy to help identify potential blood type incompatibilities between the mother and baby that could cause health problems.

Babies are screened because many inherited and metabolic conditions do not cause obvious symptoms at first but can lead to developmental delays, organ damage, or life-threatening illness if they are not found and treated within the first days or weeks of life. Early detection through newborn screening gives your baby the best possible chance at a healthy start.

During infancy, this test is important for several reasons: (1) To check for ABO or Rh incompatibility between the mother and baby, which can cause jaundice or anemia in newborns; (2) To determine if a Rh-negative mother needs Rh immunoglobulin injections to prevent complications in future pregnancies; (3) To establish the baby's blood type for medical records; (4) To ensure safe blood transfusion if the baby ever needs one.

A health care provider will gently clean your baby's heel, make a small prick with a sterile lancet, and collect a few drops of blood onto a special filter paper card. Most babies feel only a brief pinch and may cry for a moment. The blood sample is then sent to a laboratory for testing, and the results are usually shared with your baby's doctor.

A healthcare provider will collect a small blood sample from your baby's heel (heel stick) or from a vein in the arm. The blood is then sent to a laboratory where it is mixed with special antibodies to determine how the red blood cells react. This helps identify the exact blood type and Rh factor. The procedure only takes a few minutes and is generally well-tolerated by infants.

This test is very safe. The most common effects are a brief sting during the heel prick, mild fussiness, or a small bruise where the blood was drawn, and these usually go away within a few days. Serious problems such as infection are extremely rare. Sometimes a repeat sample is requested, which does not necessarily mean your baby has a health condition.

The risks are minimal and include slight pain during the blood draw, possible bruising or swelling at the puncture site, and rarely, infection. The benefits of knowing your baby's blood type far outweigh these minor risks. Your healthcare provider will ensure the procedure is done safely and comfortably for your little one.