Digestive System Blood Tests

📅 Last Updated: April 2026 | 🩺 Medically Reviewed by: Edward Salko, D.O., Medical Director | 🧪 Lab Partner: Labcorp

How important is the gut? Researchers call it the “second brain” for its network of nerves (called the enteric nervous system) that helps control digestion and communicate with the brain. Unfortunately, allergies, infections, inflammation, and other problems interfere with this vital gut/brain communication system. Personalabs has a range of tests for digestive problems you can use to support your gut health.

Digestive System Blood Tests Available at Personalabs

| Condition | Primary Test | Key Symptoms |
|—|—|—|
| Celiac Disease | Tissue Transglutaminase IgA (tTG-IgA) | Bloating, diarrhea, weight loss after eating gluten |
| H. Pylori Infection | H. Pylori Antibody IgG | Stomach pain, nausea, frequent burping, ulcers |
| Crohn’s / IBD | CRP, ESR, CBC | Chronic diarrhea, abdominal cramping, blood in stool |
| Pancreatitis | Amylase, Lipase | Severe abdominal pain, nausea, vomiting |
| Liver Disease | Hepatic Function Panel | Jaundice, fatigue, abdominal swelling |
| Lactose Intolerance | Hydrogen breath test (note: not blood-based) | Bloating, gas, diarrhea after dairy |
| Food Sensitivity | IgG Food Sensitivity Panel | Chronic bloating, fatigue, skin issues after eating |
| Malabsorption | Vitamin B12, Folate, Iron, Ferritin | Fatigue, weight loss, nutrient deficiencies |

When Digestive Symptoms Warrant a Blood Test

Digestive symptoms are among the most commonly dismissed complaints in medicine — often attributed to stress, diet, or “just how you are.” But persistent gastrointestinal symptoms frequently have a measurable biological cause that a targeted blood test can identify.

Chronic bloating and abdominal pain after eating gluten or wheat — even without a formal diagnosis — warrants a celiac panel. The tissue transglutaminase IgA test (tTG-IgA) is the most sensitive and specific first-line test for celiac disease. A positive result with an elevated total IgA confirms celiac disease with high accuracy and eliminates the need for an immediate endoscopy in many cases.

Frequent stomach pain, burning, or ulcer symptoms warrant an H. pylori antibody test. H. pylori is a bacterial infection present in roughly 44% of the
global population — many carriers have no symptoms but develop gastritis, ulcers, or in rare cases stomach cancer over time. A simple blood test
detects antibodies to the bacteria.

Chronic fatigue combined with digestive symptoms often points to malabsorption — where nutrients are not being absorbed properly due to intestinal damage, celiac disease, or inflammatory bowel disease. Testing ferritin, vitamin B12, folate, and a CMP together gives a complete nutritional
and metabolic picture that identifies malabsorption patterns.

Unexplained weight loss with abdominal symptoms always warrants a CMP, CBC, and inflammatory markers (CRP and ESR). These together can identify liver disease, kidney disease, chronic infection, or early malignancy as contributing factors.

Reviewed by Edward Salko, D.O., Medical Director, Personalabs

The Role of Gastrointestinal Blood Tests

Physicians can use gastrointestinal disease tests to help diagnose food allergies or sensitivities, chronic inflammation, the presence of harmful bacteria, or other common concerns.

Gastrointestinal issues can lead to painful or uncomfortable symptoms, so you want to seek treatment as soon as possible. Personalabs makes it simple to get digestive system tests online. Just select the tests you need, print out the order for the blood work, and take it to one of our 4,000-plus partner labs across the country. Results are typically ready within 24 to48 hours.

Types of Blood Work for Digestive System Issues

Diagnostic tests for digestive disorders include laboratory screening for enzyme levels and the production of antibodies. These antibodies can be triggered by exposure to food sensitivities such as gluten, which can cause celiac disease.

Blood tests for stomach problems can also help identify infection or inflammation in areas of the digestive tract such as the kidneys, liver, or pancreas. You could undergo blood tests or stool tests, depending on your symptoms and risks.

Who Should Get Tested for Gastrointestinal Disease?

Some conditions have a genetic component, so you may order blood tests for digestive disorders if you have a family history of gastrointestinal issues. Testing can also be recommended if you regularly experience symptoms such as heartburn, bloating, vomiting, or abdominal pain.

When to Take Blood Tests for Digestive Problems

Don’t wait to get blood tests if your symptoms are painful or prevent you from performing daily activities. Once you get accurate test results from Personalabs, you can work with your physician to develop a treatment plan that could include medication and lifestyle modifications such as changing your diet and exercise habits.

Get Tested for Gastrointestinal Disorders Near You

Personalabs offers a wide range of lab tests, including gastrointestinal disease tests, to put control of your health in your hands. You’ll feel empowered when you have the necessary data to make informed choices to enhance your well-being.

Choose from our gastrointestinal blood tests to find out more about your gut health.

Frequently Asked Questions: Digestive System Blood Tests