Calprotectin Stool (Fecal Calprotectin) Biomarker Testing
It measures gut inflammation to help sort IBD activity from IBS and guide next steps, with easy ordering and Quest lab access through Vitals Vault.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
A calprotectin stool test (also called fecal calprotectin) is a noninvasive way to check for inflammation in your intestines. It is often used when you have ongoing diarrhea, abdominal pain, or blood/mucus in stool and you need help separating inflammatory bowel disease (IBD) from non-inflammatory causes like irritable bowel syndrome (IBS).
If you already have Crohn’s disease or ulcerative colitis, this test is commonly used to track whether inflammation is calming down, staying quiet, or flaring. It can also help you and your clinician decide when symptoms might need more evaluation rather than guessing.
Your result is not a diagnosis by itself. It is one piece of evidence that should be interpreted alongside your symptoms, medications, infection testing when appropriate, and sometimes imaging or endoscopy.
Do I need a Calprotectin Stool test?
You may want a calprotectin stool test if you have persistent or recurring diarrhea, urgency, abdominal cramping, unexplained weight loss, blood in stool, or nighttime symptoms that wake you up. These patterns can raise the question of intestinal inflammation, and calprotectin is a practical first step before jumping straight to invasive testing.
This test is also useful if you have a known IBD diagnosis and you are trying to answer a specific question: “Are my symptoms coming from active inflammation, or could something else be going on?” For example, stress, diet changes, bile acid diarrhea, infections, or medication side effects can mimic a flare, and calprotectin can help you decide whether to escalate evaluation.
You may be less likely to benefit if your symptoms are brief and clearly linked to a short-lived stomach bug, or if you are already scheduled for a colonoscopy for other reasons. Even then, calprotectin can still be helpful for trending over time.
Testing supports clinician-directed care and follow-up. If your result is high or your symptoms are severe (dehydration, persistent bleeding, fever, or significant weight loss), you should seek medical evaluation promptly.
Calprotectin is measured from a stool specimen in a CLIA-certified laboratory; results help assess intestinal inflammation but do not diagnose a specific disease on their own.
Lab testing
Order a Calprotectin Stool test through Vitals Vault to establish a baseline or track a trend over time.
Schedule online, results typically within about a week
Clear reporting and optional clinician context
HSA/FSA eligible where applicable
Get this test with Vitals Vault
Vitals Vault lets you order a calprotectin stool test so you can move from “I’m not sure what’s going on” to a concrete inflammation signal you can discuss with your clinician. This is especially helpful when you are trying to decide whether symptoms fit an IBD flare pattern or something non-inflammatory.
After you order, you complete a stool collection using the kit instructions and send the sample to the lab for analysis. When your result is ready, you can use PocketMD to review what your number suggests, what follow-up questions to ask, and what related labs are commonly paired with calprotectin when symptoms persist.
If you are monitoring IBD, Vitals Vault can also support repeat testing so you can track trends over time. Trending matters because a single value can be influenced by timing, recent infections, and medications, while a pattern across weeks to months is often more actionable.
- Order online and use PocketMD to interpret your result in context
- Designed for trending over time, not one-off guesswork
- Clear next-step guidance to discuss with your clinician
Key benefits of Calprotectin Stool testing
- Helps distinguish intestinal inflammation (more consistent with IBD) from functional symptoms (more consistent with IBS).
- Provides a noninvasive way to assess gut inflammation without starting with a colonoscopy.
- Supports flare-versus-remission monitoring in Crohn’s disease and ulcerative colitis when tracked over time.
- Can help decide whether persistent symptoms warrant escalation to imaging, endoscopy, or specialist evaluation.
- Offers an objective marker to pair with symptom tracking when treatment changes are being considered.
- May reduce unnecessary antibiotics or steroids when symptoms are not driven by inflammation.
- Creates a baseline you can repeat to see whether inflammation is improving, stable, or worsening.
What is Calprotectin Stool?
Calprotectin is a protein released in large amounts by certain white blood cells (neutrophils) during inflammation. When the lining of your intestines is inflamed, more of these cells move into the gut, and calprotectin levels rise in stool.
Because it reflects immune activity in the intestinal tract, fecal calprotectin is used as a marker of intestinal inflammation. It does not tell you the exact cause of inflammation, but it can help separate inflammatory conditions (such as IBD) from conditions that typically do not cause intestinal inflammation (such as IBS).
Calprotectin is most helpful when you interpret it with your clinical picture. A high value can occur with IBD, but it can also rise with gastrointestinal infections, some medications, and other inflammatory conditions of the gut.
How it differs from blood inflammation tests
Blood markers like C-reactive protein (CRP) reflect inflammation anywhere in the body, and they can be normal even when inflammation is limited to the intestines. Calprotectin is more gut-specific because it is measured directly in stool, which is why it is commonly used for intestinal symptom workups and IBD monitoring.
Why clinicians use it in IBD monitoring
Symptoms alone do not always match what is happening in the intestinal lining. Calprotectin can help estimate whether inflammation is active, which can guide decisions about medication adjustments, additional testing, or whether it is reasonable to watch and retest.
What do my Calprotectin Stool results mean?
Low calprotectin levels
A low result generally suggests there is not significant active inflammation in your intestines at the time of testing. If you have ongoing symptoms with a low value, it raises the possibility of non-inflammatory causes such as IBS, food intolerance, bile acid diarrhea, medication effects, or post-infectious changes. If you have known IBD, a low value can be reassuring, but it does not replace clinical judgment if you have red-flag symptoms.
In-range (reassuring) calprotectin levels
An in-range result is typically interpreted similarly to a low result: it supports the idea that intestinal inflammation is unlikely to be the main driver of your symptoms right now. In IBD monitoring, an in-range value can align with remission, especially if your symptoms are stable and other markers are also reassuring. If symptoms persist, your clinician may focus on alternative explanations or consider repeating the test if timing could have missed a flare.
High calprotectin levels
A high result suggests increased intestinal inflammation and usually warrants follow-up rather than watchful waiting. In someone without an IBD diagnosis, it can be a reason to evaluate for IBD and to consider infection testing depending on your symptoms and risk factors. In someone with IBD, a high value can indicate active disease, incomplete response to treatment, or a developing flare, and trending the value after treatment changes can be informative.
Factors that influence calprotectin
Recent gastrointestinal infections can raise calprotectin, sometimes substantially, and levels may stay elevated for a period after symptoms improve. Certain medications, especially NSAIDs (like ibuprofen or naproxen), can increase gut irritation and may elevate results in some people. Timing matters: testing during a symptom peak can look different than testing after partial improvement. Sample handling and collection instructions also matter, so follow the kit directions closely and ask about repeating the test if the result does not fit your clinical picture.
What’s included
- Calprotectin, Stool
Frequently Asked Questions
What is a normal calprotectin level in stool?
“Normal” depends on the lab and the reference range printed on your report, but a lower value generally suggests little to no active intestinal inflammation at the time of testing. If your result is near a cutoff or your symptoms are changing, your clinician may recommend repeating the test to confirm the trend.
Does a high calprotectin mean I have Crohn’s disease or ulcerative colitis?
Not by itself. A high calprotectin indicates intestinal inflammation, which can occur with IBD, but it can also rise with gastrointestinal infections, medication-related irritation (such as NSAIDs), and other inflammatory conditions. A high result is usually a reason for follow-up evaluation rather than a standalone diagnosis.
Can IBS cause high calprotectin?
IBS typically does not cause intestinal inflammation, so calprotectin is often normal or low in IBS. If your symptoms look like IBS but your calprotectin is elevated, it is a signal to consider other causes and to discuss further evaluation with your clinician.
Do I need to fast for a calprotectin stool test?
Fasting is not typically required because the test measures an inflammation marker in stool rather than a blood sugar or lipid response to meals. What matters most is collecting the sample correctly and following the kit instructions.
Can medications affect fecal calprotectin results?
Yes. NSAIDs (like ibuprofen or naproxen) can increase gut irritation and may raise calprotectin in some people. Antibiotics, recent steroids, and biologic or immunomodulator therapy can also change inflammation over time, which can shift your result; this is one reason trending and timing relative to symptoms matter.
How often should calprotectin be repeated for IBD monitoring?
The right interval depends on your symptoms, recent treatment changes, and your clinician’s plan. Many people repeat it after a flare, after a medication adjustment, or periodically to confirm remission, because a trend is often more useful than a single number.
Is calprotectin a substitute for colonoscopy?
It can reduce unnecessary procedures in some situations, but it does not fully replace colonoscopy. Calprotectin helps estimate inflammation, while colonoscopy can directly visualize the lining, take biopsies, and evaluate complications. If your calprotectin is high or you have red-flag symptoms, your clinician may still recommend endoscopic evaluation.