Phenylketonuria (PKU) test, also known as PKU newborn screening or PKU metabolic screening, is one of the most common newborn tests performed in the United States. It is, in fact, mandatory in the United States and Canada. Babies who are born with Phenylketonuria inherit this genetic disease from their parents. It is an inherited defect in metabolism which results in reduced absorption of phenylalanine amino acid. It can lead to serious health issues. Read on to know more about the PKU test at birth, how a PKU blood test can help detect the disease and other relevant details.
The Phenylketonuria (PKU) Test is performed to check if the newborn has PKU. This condition can result in severe damage to the brain, nervous system, cause intellectual disability and various other health problems. The issue generally occurs in the first year of the child’s life, causing the infant to be bizarrely sleepy and listless. They tend to develop red itchy rash and can experience difficulty feeding. Babies with PKU condition have lighter skin and hair than other family members and babies who do not have PKU condition.
1 in every 10,000 -15,000 babies born in the United States gets affected by PKU. Newborns must take the infant PKU test in the United States of America. Here is the answer to the commonly asked question, “Why is the PKU test so important?”
PKU is a metabolic disorder and is an inherited congenital disability condition in newborn babies. The buildup of phenylalanine in the body causes PKU; the body uses this amino acid to break other proteins. As this is inherited, it essentially means that the defect has passed on from the parent to the child through genes.
PKU is caused when there is a defect in the PAH gene in the body. The defect in the gene alters the way phenylalanine is broken down and absorbed by the body during digestion. When a parent has 1 mutated gene, they can pass PKU to the children. This means that both parents are carriers of the defective gene.
However, they necessarily do not have symptoms of PKU. Similarly, if the child inherits the PAH gene from just one parent, the child will undergo a gene change for PKU. The child will become a carrier of PKU while will not have diseases himself. This also makes PKU an autosomal recessive disease.
When a newborn is neither diagnosed nor treated, phenylalanine may begin to build up in the baby’s bloodstream. The moment the phenylalanine level reaches the brain, it tends to cause irreversible damage to the brain, nervous system, tissues, and permanent damage to other organs. The PKU signs and symptoms can range from being very mild to extremely severe. Below is the list of signs and symptoms of PKU in a baby:
It is a needle stick test. Hence there is little or no risk to the baby. When the needle is poked in the baby’s heel, the baby will feel a little pinch. A very small bruise may occur at the point where the needle is pricked. This usually goes away pretty quickly. On rare occasions, there could be a little bleeding, infection, or possibly a sore.
Phenylketonuria (PKU) Test is a blood test performed on newborns within 24 to 72 hours of their birth. The test should not be performed 24 hours after birth. The baby would have consumed some protein through the mother’s breastmilk or some other formula by this time. This helps to ascertain accurate test results.
The PKU test screening is performed with a heel prick, needle stick test. The test is done by withdrawing a few drops of blood from the baby’s heel. Another alternative to heel prick is the urine test. The doctor will collect a sample of urine from the baby.
There is no special preparedness required for the child before the Phenylketonuria (PKU) Test. Ensure the healthcare provider is aware of all the medicines, vitamins, herbs, and other supplements the mother is consuming, as she would breastfeed the newborn.
The PKU test results can vary from one child to the other. These depend on the child’s age, gender, prior health history, the method of the test, and other factors. The test result of the child does not necessarily mean that there is a problem. Consult with your health care provider to understand in detail what the test results mean for the child.
As PKU is a genetic condition, the doctor may ask the parents and the baby to undergo a genetic test. If the test results are not normal, then the health care provider will advise performing more tests to confirm the test result or to be able to rule it out. It could be doing another set of urine tests and or blood tests. However, if the test results that come as normal were performed within 24 hours after the baby’s birth, your health care provider will advise you to do the tests again after the baby is at 1 -2 weeks of age.
The PKU diagnostic test determines the presence of phenylalanine in the blood. The normal reference range of phenylalanine in the blood is supposed to be less than 2 mg/dl (milligrams per deciliter). It is considered high when the test result shows more than 4 mg/dl of phenylalanine in the blood. This means that the child has PKU. The test will again be repeated once the baby is 7 to 14 days old.
Different factors can affect Child’s PKU Test Results. Some of the common factors are listed below:
Babies born with PKU are treated with special dietary specifications. This is to check and reduce the levels of phenylalanine continuously. The ways to treat the babies with PKU are as follows:
Having a baby with PKU needs to be managed well at home. Below are some simple and effective home remedies and methods that parents can try to manage a baby with PKU.
It is crucial to keep track and record every bit of food eaten every day by the baby. Sticking to the dietician’s diet plan and guidelines will go a long way in managing the treatment. Buy food measuring cups, measuring spoons, and a kitchen scale to measure the exact portion of food that needs to be given to the baby. The amount of phenylalanine consumed needs to be calculated every day. Divide the portion of each snack and meal to consume food with normal PKU levels.
It is good to buy foods that are very low in protein content and readily available in retail food stores, such as low protein bread, flour, rice, pasta, etc. The best part is, these foods that PKU kids eat are similar to what everyone else eats. It brings a sense of togetherness to the family. These products like the PKU formula may not be very pocket-friendly but are worth trying if you have to maintain your expenses properly.
Use your creative bent of mind to experiment with food. Consult your diet planner to add variety to your food, keeping in mind the PKU limitations. You can try different cooking methods and seasonings to cook vegetables and other food with low phenylalanine content. Measure and count all your ingredients to suit an individual’s diet plan.
It is challenging to live with a PKU child. Below are some strategies that can be tried.
PKU is a lifelong condition. However, with some planning and the right guidance, you can overcome the challenges and make life easy for your PKU kid and yourself. Continuously research this topic and consult your doctor, dietitian in a scheduled & timely manner. Maintain the food trackers and perform routine PKU screening. All this put together will help your PKU child lead a healthy life.
This post was last modified on November 25, 2021 6:11 pm
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