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Gastrointestinal Lab Tests

The gastrointestinal system consists of the stomach and intestines. However, when lab tests are done, we actually test the function of the pancreas, liver and gallbladder. Health professionals who utilize functional lab testing focus on tests that assess the health of your body's core body systems: Hormones, immunity, digestion, and metabolism. The gastrointestinal tract is the core system that determines how other body systems will operate. Therefore, most every person we consult has one or more gastrointestinal tests performed.

Several of our lab partners perform Gastrointestinal Lab Tests. Please refer to the About the Labs We Utilize section of the website for links to all of our lab partners and a full list of tests performed by each lab.

For sample reports of some of the lab tests we order please see the links below.

Gastrointestinal Lab Test

Comprehensive Digestive Stool Analysis - Doctors Data

Gastrointestinal complaints are among the most common reasons that patients seek medical care. Symptoms associated with GI disorders include persistent diarrhea, constipation, bloating, indigestion, irritable bowel syndrome and malabsorption. The Comprehensive Stool Analysis can help assess digestive and absorptive functions, the presence of opportunistic pathogens and to monitor the efficacy of therapeutic remediation of GI disorders. Antimicrobial susceptibility testing to prescriptive and natural agents is also performed for appropriate bacterial and fungal species at no additional charge.


The Comprehensive Stool Analysis does not include analysis for parasites. For assessment of the presence for parasites, consider the Comprehensive Stool Analysis with Parasitology.

Download a sample report here.

Gastrointestinal Lab Test

Calprotectin - DiagnosTechs

Calprotectin is a reliable noninvasive marker for differentiating gastrointestinal inflammation associated with Inflammatory Bowel Disease (IBD) from inflammation that may be associated with Irritable Bowel Syndrome (IBS). Such differentiation is very important because IBD can be life threatening. Monitoring the levels of fecal calprotectin can play an essential role in determining the effectiveness of clinical interventions, and is a good predictor of IBD remission and relapse. Calprotectin provides clinicians with a valuable tool, not only for differentiating IBD from IBS, but also allowing them to monitor and predict treatment outcomes and enabling better management of IBD flare ups.

Download a sample report here.

Gastrointestinal Lab Test

Elastase - Stool - Doctors Data

Pancreatic Elastase (PE) is a simple, noninvasive fecal marker for assessing exocrine pancreatic function, allowing the clinician to establish a prompt and reliable diagnosis with high degrees of sensitivity (90%-100%) and specificity (93%-98%) in suspected cases of pancreatic insufficiency. Sensitivity is lower in milder cases of pancreatic insufficiency, but is quite high (95%-100%) in moderate to severe cases.

Download a sample report here.

Gastrointestinal Lab Test

GI Pathogen Profile, Multiplex PCR - Stool - Doctors Data

Viruses, parasites, and bacteria — now you can receive 22 results with 1 test.


Overlapping symptoms - compounded by the lack of testing methods that could identify a full range of viruses, parasites, and bacteria - have historically made GI infections difficult to diagnose. The GI Pathogen Profile, an FDA-cleared molecular test, uses the FilmArray multiplex PCR system to identify 22 viruses, parasites, and bacteria with up to 98.5% overall sensitivity and 99.3% overall specificity.


While bacteria and parasites are the primary cause of food & water-borne diarrheal illness (48 million infections/year), the vast majority of acute diarrheal illness is caused not by bacteria or parasites, but by viral infections. In fact, Norovirus is the primary gastrointestinal infection occurring in the United States. Even though testing for pathogenic bacteria and parasite is commonly available, there has been limited availability of viral testing until recently.

Download a sample report here.

Gastrointestinal Lab Test

Helicobacter Pylori Antigen - Saliva - DiagnosTechs

Helicobacter pylori, also known as H pylori, is a spiral shaped bacterium that lives in the stomach and duodenum (section of intestine just below stomach). It has a unique way of adapting in the harsh environment of the stomach. H. pylori is the major cause of peptic ulcer disease and is associated with stomach cancer. The Helicobacter Pylori Antigen test is used to determine if H. pylori is present.


The Helicobacter pylori antigen test establishes the presence and possible etiologic role of Helicobacter pylori in cases of chronic gastric ulcer, gastritis, duodenal ulcer, dyspepsia, etc.

Download a sample report here.

Gastrointestinal Lab Test

Intestinal Permeability - Urine - Doctors Data

The Intestinal Permeability test measures the ability of two sugar molecules, lactulose and mannitol, to permeate the intestinal epithelial barrier. Ordinarily, mannitol is efficiently absorbed but lactulose, a larger molecule, is not. This test can help to identify malabsorption and "leaky gut" syndrome (abnormal intestinal permeability), which is often associated with inflammation specifically in the gastrointestinal tract. This test requires a baseline urine collection followed by a six-hour timed urine collection after ingesting a lactulose and mannitol solution.


The lactulose/mannitol solution must be obtained separately from a pharmacy.
The Doctor's Data test is not currently available in New York.

Download a sample report here.

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