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IgA anti-tissue transglutaminase, IgA Anti-tTG, celiac disease testing
This test is used to see if you have celiac disease. It is also used to see how well people with the condition are doing. It is one of several blood tests that may be used to help diagnose celiac disease.
Tissue transglutaminase is an enzyme that fixes damage in your body. People with celiac disease often make antibodies that attack this enzyme. These are called anti-tissue transglutaminase antibodies, or immunoglobin A (IgA) antibodies. A blood test that shows higher levels of anti-tissue transglutaminase antibodies can help your health care provider figure out if you have celiac disease.
If you have celiac disease, you are allergic to gluten. Gluten is the protein found in wheat, rye, and barley. Celiac disease is an autoimmune disorder. This means your body attacks itself. With celiac disease, your body attacks the lining of the small bowel, making it less able to absorb nutrients. The sensitivity to gluten can also cause pain in the abdomen, low blood count (anemia), tiredness, muscle and joint pain, gas, diarrhea, vomiting, weight loss, and malnutrition.
If your health care provider thinks you have celiac disease, he or she may order several other blood tests. These may look for antigliadin antibodies and antiendomysium antibodies.
Your provider may also take a tissue sample (biopsy) from your small bowel to confirm the blood tests' findings. The biopsy is important to confirm a diagnosis of celiac disease. It should be done when possible. The biopsy is done using a tubelike device (endoscope) put down your throat and into the small intestine. Your provider uses it to get the sample without doing surgery.
A result for a lab test may be affected by many things, including the method the lab uses to do the test. Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your health care provider.
Keep in mind that no one test can say for sure that you have celiac disease. Your health care provider will use other things to help confirm the diagnosis.
The higher the levels of anti-tissue transglutaminase antibodies in your blood, the more likely it is that you have it or a related disorder. Younger children are an exception to this rule. A test may come back negative even if the child has celiac disease. But other tests can give a proper diagnosis.
The test requires a blood sample, which is drawn through a needle from a vein in your arm.
Taking a blood sample with a needle carries risks that include bleeding, infection, bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight stinging sensation or pain. Afterward, the site may be slightly sore.
This test is considered the best and most specific blood test for diagnosing celiac disease. But 2% to 3% of people with celiac disease don't have enough IgA antibodies, the substance the test looks for. This can lead to a false-negative result.
In addition, the test is not as accurate for young children. Other tests may need to be done to confirm celiac disease.
If the test is to diagnose celiac disease, it is best to have it before you stop eating gluten. This is because the lack of gluten could give a negative test result even if you have celiac disease. If the test is to see how well you are doing with celiac disease, you don't need to get ready for the test. Be sure your health care provider knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use.
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