How To Order Your Labs

1. Order Labs
Order online or over the phone:  1-877-511-LABS.

No doctor or consultation visit is needed. We include the required doctors order with all our testing. 

You will not incur any additional charges at the lab. Our prices are all inclusive.

2. Find Lab Near You

Find a LabCorp or Quest Diagnostics location near you on our Lab Locator. After ordering your lab testing, you will receive an email with your lab requisition.  Bring this requisition form (printed or on phone) to the laboratory.

No appointment is needed, but making one can minimize the wait time. 

3. Lab Results Ready

We’ll email you when your results are ready. You can access the test results logging into our portal with your secure account.

Most results take 1-2 days, but some take longer. See the test description for an estimate on how long your results might take.

Certain result values may prompt a phone call from our ordering provider to ensure the patient is aware of their result.

Check status of your results on the "Where are my results" page.

Celiac Gluten Lactose Testing

Why Order Gastrointestinal Tests Online?

At Health Testing Centers we make gastrointestinal testing easy by allowing you to avoid the hassle of visiting your doctor. We provide gastrointestinal testing, including Doctor's oversight, using the same labs that your doctor utilizes. Test results are securely delivered to you, saving you time and money.

 Fast, accurate, clear lab results without doctor visit
 100% satisfaction guarantee
 Private and confidential

Carefully designed by our physicians these panels provide a thorough analysis of your gastrointestinal health, helping identify health concerns before they progress into chronic or life-threatening conditions.

Featured Gastrointestinal Tests and Packages

Featured Tests and Packages
CICA FULL ARRAY Genetic and Antibody Testing

The Celiac, IBS, and Crohn’s Array (CICA) evaluates your genetic risk and serum markers associated with celiac disease, and genetic serum markers associated with Crohn’s disease.

Gluten Sensitivity Screen (Celiac and Wheat Allergy)

Detects antibodies to screen for celiac disease, other gluten sensitivity, or wheat allergy.

Gastrointestinal Lab Tests (A-Z)

Lab Tests (A-Z)
Anti-Gliadin Ab

This test detects antibodies that are created when the body cannot adequately process gluten. AVAILABLE AT LABCORP ONLY.

Celiac Disease Antibody Profile

Detects antibodies associated with celiac disease

CICA Antibody Testing

The Celiac, IBS, and Crohn’s Array (CICA) detects specific antibodies, and measures potentially inflammatory cellular reactions in your body that are associated with Celiac Disease and Crohn's Disease.

CICA Array Genetic Testing

The Celiac, IBS, and Crohn’s Array (CICA) evaluates your genetic risk for celiac disease and genetic markers associated with Crohn’s disease.

Deamidated Gliadin Antibodies, IgG

This test is used to detect the presence of Gliadin IgG antibodies only.

Fecal Occult Blood (Immunoassay)

This at home test is used to detect blood or microscopic blood (occult blood) in your stool.


This test measures the level of gastrin in the body.

Giardia lamblia, Stool

This test may be used to detect the parasitic organism, Giardia Lamblia,  which causes Giardiasis.

Gluten Sensitivity Screen (Celiac and Wheat Allergy)

Detects antibodies to screen for celiac disease, other gluten sensitivity, or wheat allergy.

H. pylori (Helicobacter pylori) Antibodies

Detects antibodies associated with H. pylori infection. AVAILABLE AT LABCORP ONLY.

H. pylori (Helicobacter pylori) Urea Breath Test

This test analyzes breath samples before and after drinking a certain liquid to detect the presence of Helicobacter pylori (H. pylori), a bacteria in the stomach

Lactose Tolerance

Evaluates blood samples before and after lactose to assess for lactose intolerance.

Ova and Parasite, Stool

The ova and parasite (O&P) stool exam may be used to detect the presence of parasites in a stool sample.

Saccharomyces Cerevisiae Antibody Profile ( ASCA)

This test is used for the detection of IgA and IgG Saccharomyces cerevisiae antibodies.

Stool Culture

This test may be used to detect the presence of bacterial organisms such as Salmonella, Shigella, Campylobacter and E.Coli Shiga toxin in the stool.

Tissue Transglutaminase IgA

This test is used to detect Tissue Transglutaminase IgA antibodies only.

Tissue Transglutaminase IgG

This test is used to detect Tissue Transglutaminase IgG antibodies only.

Gluten Intolerance, Celiac Disease and Gastrointestinal Health

What is celiac disease and gluten intolerance?

Celiac disease is an autoimmune disorder that affects about 1 of every 100 people worldwide, according to the Celiac Disease Foundation, and about 2.5 million Americans are completely unaware that they have the disorder. People affected by the condition suffer damage to small intestine when they eat foods containing gluten, a protein found in grains, including wheat, barley, and rye. When a person who has the disease eats foods that contain gluten, the immune system mistakenly identifies this protein as a hazard to the body. As a result, it attacks gluten like it would a foreign bacteria or virus, causing damage to the lining of the small intestine in the process. People who have celiac disease may experience symptoms when gluten is consumed that include:

  • Abdominal pain
  • Abdominal bloating and gas
  • Chronic diarrhea
  • Nausea and/or vomiting
  • Fatigue
  • Weight loss
  • Irritability
  • Skin rash
  • Iron deficiency and/or anemia
  • Bone or joint pain

Gluten intolerance, also commonly called non-celiac wheat sensitivity or gluten sensitivity, is a condition in which a person has the symptoms of celiac when eating gluten containing foods – symptoms that disappear when gluten is removed from the diet. However, they do not test positive for celiac disease.

When left untreated, these conditions can cause or increase risk of a number of health problems. These include:

  • Malnutrition
  • Iron deficiency anemia
  • Bone loss/Osteoporosis
  • Dental problems
  • Other autoimmune conditions, such as type 1 diabetes and multiple sclerosis
  • Neurological problems
  • Infertility and miscarriage
  • Gall bladder disease

Who should be tested for celiac disease and gluten intolerance?

Anyone who has noticed any or all of the symptoms listed above should be screened for celiac disease and gluten intolerance. Since these disorders tend to run in families, anyone who has a close relative who has been diagnosed with celiac or gluten sensitivity should also be tested. Children who are small in stature, have ADHD, failure to thrive, or delayed puberty should also be tested, as these can be signs of poor nutrient absorption associated with celiac disease or gluten intolerance.

What's the connection between lactose intolerance and celiac disease or gluten sensitivity?

Lactose intolerance is when a person has trouble digesting lactose, a type of sugar found in milk. This typically results in uncomfortable symptoms when dairy foods are consumed, such as:

  • Diarrhea
  • Nausea
  • Bloating
  • Abdominal pain and/or cramping

Lactose intolerance is a very common side-effect of celiac disease or non-celiac gluten sensitivity. That's because lactase, the enzyme that breaks down lactose, is made in the small intestine, and the damage to the lining of the small intestine by celiac disease or gluten intolerance can prevent it from making enough lactase to digest dairy foods. In most cases, lactose intolerance associated with celiac disease or gluten sensitivity is a temporary problem that resolves as a person receives treatment and the damaged intestine begins to heal. However, it can worsen celiac/gluten sensitivity symptoms until that healing occurs. For that reason, people diagnosed with these gluten-related conditions should also have a test for lactose intolerance.

Simple blood tests can detect evidence of celiac disease and gluten intolerance, helping to diagnose these disorders. Among the lab tests most commonly used are:

  • Tissue Transglutaminase Antibodies (tTG-IgA) – This blood test screens for and measures levels of Tissue Transglutaminase IgA antibodies, which are produced as part of the immune response to gluten in people affected by celiac disease.
  • Anti-Gliadin Ab – This blood test detects and measures levels of antibodies that may be created by the body in response to gliadin, a protein that is a component of gluten. High levels can indicate celiac disease or gluten sensitivity.
  • Gluten Sensitivity Screen (Celiac and Wheat Allergy) – This is a multi-step blood test designed to detect certain antibodies present in the body when it cannot process gluten. First, tissue transglutaminase antibodies (TTG) and a deaminated gliadin peptide (DGP) antibodies tests are done to screen for celiac disease. If those tests are negative for celiac-related antibodies, the blood will then be tested for antibodies to native gliadin (AGA), which are found in cases of non-celiac gluten sensitivity. Finally, if the AGA test is negative, the sample is tested for wheat allergy.

People with test results that indicate a high probability of celiac disease are typically sent for a biopsy of the small intestine to confirm a celiac diagnosis.

Where can I get gastrointestinal testing near me?

Search for convenient gastrointestinal testing lab locations near you using our Lab Locator.