When digestive symptoms persist, it can be hard to know how much testing is enough. A good digestive evaluation is thorough where it needs to be, targeted everywhere else, and done in an order that keeps the results meaningful. For many women, that means fewer tests than they expect, each chosen for a reason.
This article walks through what that looks like, step by step, using guidance from US gastroenterology societies and federal health agencies.
Step one: the history comes first
The most important part of a digestive evaluation is not a test. It is a careful account of the symptoms: what they are, when they started, how they relate to meals, bowel habits, the menstrual cycle, sleep, and stress, and what has already been tried.
The history also answers the first and most important question: are there warning signs? Blood in the stool or dark stools, anemia (especially from low iron), vomiting, unintended weight loss, symptoms that wake you at night, symptoms that begin for the first time at age 50 or older, a parent, sibling, or child with colorectal cancer, inflammatory bowel disease, or celiac disease, worsening heartburn, a sudden change in symptoms, or, in women, persistent bloating with early fullness or pelvic pain all change the path. When warning signs are present, imaging and endoscopy, upper, lower, or both, may be considered early, and some findings need a gastroenterologist directly. Iron deficiency anemia after menopause is one of them: the American Gastroenterological Association recommends examining both the upper and lower digestive tract, even when there are no digestive symptoms. A separate article covers these warning signs in detail.
Step two: a diagnosis can be made on its pattern
When warning signs are absent, the American College of Gastroenterology recommends what it calls a positive diagnostic strategy for irritable bowel syndrome. In plain terms, IBS can be diagnosed by its recognizable pattern of symptoms, with a few targeted tests, rather than by ruling out every other possible condition first. The College notes that this approach shortens the time to appropriate treatment.
That does not mean no testing. It means testing with a purpose.
Step three: targeted tests, each with a reason
The tests below come from US guidance. Not everyone needs all of them. Each is used when the symptoms point toward it.
Celiac blood test (tTG-IgA, with total IgA). Looks for celiac disease. Used for bloating, diarrhea, abdominal pain, or weight loss without a clear cause. Also one part of evaluating iron deficiency, never the whole of it. Must be done while eating gluten.
Blood count and iron studies. Look for anemia and low iron. Anemia is a warning sign in its own right. After menopause, iron deficiency anemia calls for upper and lower endoscopy, not a celiac test alone.
Fecal calprotectin, a stool test. Looks for inflammation that suggests inflammatory bowel disease. Used for suspected IBS with diarrhea, to rule out IBD.
Breath testing. Looks for small intestinal bacterial overgrowth, or trouble digesting certain sugars. Used when the history suggests either.
Imaging and endoscopy, upper, lower, or both. Look for structural causes and sources of bleeding. Used when warning signs are present.
Testing of anorectal function. Looks at how the pelvic floor and rectum work together. Used when constipation is part of the picture.
Colorectal cancer screening. Looks for colorectal cancer and polyps. Starts at age 45, or earlier with a strong family history.
Step four: the order matters
Some tests only work under the right conditions, so the sequence of a workup is part of its quality.
The clearest example is celiac disease. Celiac testing is only accurate while gluten is in the diet. If an elimination diet starts first, a celiac diagnosis can be missed. That is why testing comes before dietary change, not after it.
The same logic applies to elimination diets in general. When a food intolerance is suspected or diagnosed, a structured dietary trial, such as a low-FODMAP diet, may be recommended. FODMAPs are a group of carbohydrates that are poorly absorbed and fermented by gut bacteria, which can produce gas and bloating. A structured diet is most useful after the tests above have ruled out what they need to rule out.
What a workup does not need
A complete workup is not the same as a large one. Some widely marketed tests do not belong in it.
The clearest example is IgG food sensitivity panels. The American Academy of Allergy, Asthma, and Immunology states that this test has never been scientifically proven to do what it reports to do. The presence of IgG to a food is likely a normal immune response to eating that food. A long list of "sensitivities" from this test can lead to unnecessary restriction without a reliable reason behind it.
A good rule is to ask, of any test: what will the result change? If the answer is nothing, the test is not part of a careful evaluation.
What you should leave with
At the end of a complete evaluation, you should know three things: what has been ruled out, what is most likely going on, and what the next step is, whether that is treatment, a dietary trial, a recheck, or a referral to a gastroenterologist.
That clarity is the point of a workup. More tests do not always produce it. The right tests, in the right order, usually do.
The Energē Editorial answers one question like this each month, with sources printed in full. Join the Editorial.
If you are located in Virginia and would like your own picture evaluated, request an Energē Introduction.
This article is general education. It is not medical advice and does not replace care from your own clinician.
Sources
Lacy BE, Pimentel M, Brenner DM, et al. ACG Clinical Guideline: Management of Irritable Bowel Syndrome. American Journal of Gastroenterology. 2021;116(1):17–44.
Moshiree B, Drossman D, Shaukat A. AGA Clinical Practice Update on Evaluation and Management of Belching, Abdominal Bloating, and Distention: Expert Review. Gastroenterology. 2023;165(3):791–800. Summarized in Emory University slides.
Arnold MJ. Diagnosis and Management of Celiac Disease: Guidelines From the American College of Gastroenterology. American Family Physician. 2024;109(1):92–93.
National Institute of Diabetes and Digestive and Kidney Diseases. Eating, Diet, & Nutrition for Celiac Disease. Last reviewed October 2020.
National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Gas in the Digestive Tract. Last reviewed June 2021.
MedlinePlus Medical Encyclopedia, National Library of Medicine. Abdominal bloating. Reviewed April 6, 2020.
Centers for Disease Control and Prevention. Symptoms of Ovarian Cancer. February 26, 2025.
Centers for Disease Control and Prevention. 45 Is the New 50 for Colorectal Cancer Screening. Reviewed August 13, 2024.
American Academy of Allergy, Asthma & Immunology. IgG Food Test. May 12, 2026.
Ko CW, Siddique SM, Patel A, et al. AGA Clinical Practice Guidelines on the Gastrointestinal Evaluation of Iron Deficiency Anemia. Gastroenterology. 2020.
