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Health Information For Parents
A blood test is when a sample of blood is taken from the body to be tested in a lab. Doctors order blood tests to check things such as the levels of glucose, hemoglobin, or white blood cells. This can help them detect problems like a disease or medical condition. Sometimes, blood tests can help them see how well an organ (such as the liver or kidneys) is working.
An ALT test measures the level of alanine aminotransferase, also called ALT or SGPT. ALT is one of the enzymes that help the liver convert food into energy. High levels of these enzymes can be a sign that the liver is injured or irritated, and the enzymes are leaking out of the liver cells.
An ALT test may be done if a child has signs of a possible problem with the liver, such as jaundice (yellowish skin or eyes), dark urine, nausea, vomiting, or belly pain. It also might be done if a child is on medicine that makes high liver enzyme levels more likely.
Your child may be asked to stop eating and drinking for 8 to 12 hours before the ALT test. Tell your doctor about any medicines your child takes because some drugs might affect the test results.
Wearing a T-shirt or short-sleeved shirt for the test can make things easier for your child, and you also can bring along a toy or book as a distraction.
Most blood tests take a small amount of blood from a vein. To do that, a health professional will:
In babies, blood draws are sometimes done as a “heel stick collection.” After cleaning the area, the health professional will prick your baby’s heel with a tiny needle (or lancet) to collect a small sample of blood.
Collecting a sample of blood is only temporarily uncomfortable and can feel like a quick pinprick.
Parents usually can stay with their child during a blood test. Encourage your child to relax and stay still because tensing muscles can make it harder to draw blood. Your child might want to look away when the needle is inserted and the blood is collected. Help your child to relax by taking slow deep breaths or singing a favorite song.
Most blood tests take just a few minutes. Occasionally, it can be hard to find a vein, so the health professional may need to try more than once.
The health professional will remove the elastic band and the needle and cover the area with cotton or a bandage to stop the bleeding. Afterward, there may be some mild bruising, which should go away in a few days.
Blood samples are processed by a machine, and it may take a few hours to a day for the results to be available. If the test results show signs of a problem, the doctor might order other tests to figure out what the problem is and how to treat it.
An ALT test is a safe procedure with minimal risks. Some kids might feel faint or lightheaded from the test. A few kids and teens have a strong fear of needles. If your child is anxious, talk with the doctor before the test about ways to make the procedure easier.
A small bruise or mild soreness around the blood test site is common and can last for a few days. Get medical care for your child if the discomfort gets worse or lasts longer.
If you have questions about the ALT test, speak with your doctor or the health professional doing the blood draw.
A blood test might sound scary, but it usually takes less than a minute. Watch what happens in this video for kids.
Hepatitis is an inflammation of the liver. Most cases are caused by a virus â either hepatitis A, hepatitis B, or hepatitis C â all of which can be passed to others by someone who is infected.
These videos show what’s involved in getting a blood test and what it’s like to be the person taking the blood sample.
This group of blood tests provides doctors with clues about how the body is working. Find out why doctors do these tests and what’s involved for teens.
If your liver isn’t working properly, it can affect your overall health. Find out why doctors do liver function tests and what’s involved for teens.
An aspartate aminotransferase (AST) blood test is often part of an initial screening for liver problems.
Liver function tests can help doctors see if the liver has been damaged. They also can help diagnose infections and monitor medications that can cause liver-related side effects.
Doctors order basic blood chemistry tests to assess a wide range of conditions and the function of organs.
Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
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