Blood Test for Early Cancer Detection

Celiac disease is an autoimmune condition that affects the digestive system, specifically triggered by consuming gluten, a protein found in wheat, barley, and rye. When people with celiac disease eat gluten, their immune system responds by attacking the small intestine, damaging the tiny, finger-like projections called villi that line the intestinal wall. These villi are responsible for absorbing nutrients from food, so when they become damaged, the body cannot properly absorb essential vitamins, minerals, and other nutrients. This can lead to various health problems including malnutrition, anemia, osteoporosis, and other complications if left untreated.

Laboratory testing plays a crucial role in diagnosing celiac disease. The first step typically involves blood tests that look for specific antibodies produced when someone with celiac disease consumes gluten. The most common tests measure tissue transglutaminase antibodies (tTG-IgA) and endomysial antibodies (EMA-IgA). Additionally, a total IgA level test may be performed because some people with celiac disease have IgA deficiency, which could lead to false-negative results on the antibody tests. If IgA deficiency is detected, alternative tests measuring IgG antibodies may be used instead. It is important to note that these blood tests are only accurate if the person has been eating gluten regularly; following a gluten-free diet before testing can lead to false-negative results.

If blood test results suggest celiac disease, doctors usually recommend an endoscopic biopsy of the small intestine to confirm the diagnosis. During this procedure, a small tissue sample is taken from the intestinal lining and examined under a microscope for characteristic damage to the villi. This biopsy remains the gold standard for diagnosing celiac disease. Genetic testing for specific markers called HLA-DQ2 and HLA-DQ8 may also be performed, as nearly all people with celiac disease carry one or both of these genetic variants. However, having these genes does not necessarily mean someone will develop celiac disease, as they are also present in a significant portion of the general population.

The only effective treatment for celiac disease is strictly following a lifelong gluten-free diet. Once gluten is eliminated from the diet, the intestinal damage typically begins to heal, and symptoms improve. Follow-up blood tests may be performed several months after starting a gluten-free diet to ensure antibody levels are decreasing, which indicates proper adherence to the diet and healing of the intestine. Regular monitoring through laboratory tests helps healthcare providers assess how well someone is managing their condition and whether the intestinal lining is recovering properly.