Mode
Text Size
Log in / Sign up

Endoscopic investigation for iron deficiency anemia reveals 52.0% prevalence of normal upper gastrointestinal findingsUnderstanding the Common Findings in Endoscopy for Patients with Iron Deficiency

AI-generated summary of the cited source, checked by automated accuracy review. How we work

Key Takeaway
Note that 52.0% of upper GI endoscopies and 66.0% of lower GI endoscopies are normal in patients with iron deficiency anemia.

This meta-analysis synthesized data from a large population of 9,807 adults aged 18 years or older who presented with confirmed iron deficiency anemia (IDA) and underwent endoscopic investigation. The study aimed to quantify the prevalence of various gastrointestinal findings, including both nonmalignant and malignant conditions, in this specific patient cohort. By aggregating data from a large sample size, the analysis sought to provide clinicians with a clearer understanding of what to expect during endoscopic workups for patients presenting with IDA.

The primary objective was to determine the prevalence of normal findings, individual nonmalignant findings, and malignancy. The results indicated that 52.0% of patients underwent upper gastrointestinal endoscopy with no abnormalities detected. In the lower gastrointestinal tract, 66.0% of patients had no abnormalities during endoscopic investigation. These figures suggest that while many patients with IDA will have normal endoscopic findings, a significant portion will present with identifiable issues.

Secondary outcomes focused on specific nonmalignant and malignant conditions. The prevalence of Helicobacter pylori gastritis was reported at 27.0%. Furthermore, the prevalence of hemorrhoids was found to be 10.0%. Regarding malignancies, the study identified an upper gastrointestinal malignancy prevalence of 5.0% and a colorectal cancer prevalence of 8.0%. These figures provide specific targets for clinicians when evaluating the likelihood of finding underlying pathology in patients with iron deficiency.

Safety and tolerability data were not reported in this meta-analysis, as is common in studies focusing on diagnostic prevalence rather than intervention outcomes. The study did not report any adverse events or discontinuation rates. Because this is a meta-analysis of existing data regarding diagnosis prevalence, the focus remains on the statistical likelihood of findings rather than the safety profile of the endoscopic procedure itself.

These results provide a quantitative framework for clinical decision making. By establishing that 52.0% of upper GI endoscopies and 66.0% of lower GI endoscopies in IDA patients are normal, the data can help clinicians weigh the necessity of invasive procedures against the risk of finding significant pathology. The identified prevalence rates for Helicobacter pylori gastritis (27.0%) and colorectal cancer (8.0%) offer specific benchmarks for clinical suspicion.

Methodological limitations noted include the need for further population-based studies, particularly among relevant subgroups to refine these estimates. As a meta-analysis, this study does not establish direct causality between iron deficiency anemia and specific gastrointestinal findings; it provides an observational prevalence of conditions in a cohort with IDA. There are no reported p-values or confidence intervals provided in the source data for the primary or secondary outcomes.

Clinical implications suggest that these prevalence figures should serve as a guide during the decision-making process before performing endoscopy in patients with IDA. The results help quantify the expected yield of both benign and malignant findings. Questions remain regarding how these percentages vary across different demographic subgroups, which would require further population-based studies to resolve.

How this fits prior evidence

How this fits prior evidence: This meta-analysis addresses a gap in understanding the prevalence of gastrointestinal pathology specifically in patients with iron deficiency anemia (IDA). While previous coverage has focused on the management of IDA in pediatric populations using liposomal iron, micronutrient powders for malaria-induced anemia, and the role of trace elements like Fe, Zn, Mg, and Cu in pediatric cases, this study provides data on adult outcomes. It specifically quantifies the prevalence of nonmalignant findings like Helicobacter pylori gastritis (27.0%) and malignancies like colorectal cancer (8.0%) in adults with IDA.

When a person has iron deficiency anemia, it means their body does not have enough iron to make healthy red blood cells. Doctors often need to find out why this is happening. One common way they do this is by using an endoscopy, which involves a small camera to look inside the stomach and intestines. This study looked at thousands of people who had these tests to see what was found most often.

In many cases, the results of the test are normal. About 52% of patients had no issues found in their upper digestive tract, and about 66% had no problems in their lower digestive tract. This means that while an endoscopy is a very important tool for finding problems, it does not always find a physical issue.

When the tests did find something, many were common conditions. For example, about 27% of people had a type of stomach irritation caused by a common bacteria called Helicobacter pylori. Another common finding was hemorrhoids, which were found in about 10% of patients. These are non-cancerous issues that can still cause problems with iron levels.

While the goal of an endoscopy is often to rule out serious diseases, it is important to know how often those specific conditions appear. The study found that about 5% of people had a serious growth in their upper digestive tract, and about 8% had colorectal cancer. Knowing these numbers helps doctors decide how to talk to patients and plan the next steps for care.

Overall, this information helps healthcare providers understand what to expect when testing patients with low iron. While many tests come back normal or show minor issues like irritation, the procedure remains a key way to rule out more serious conditions. It helps give doctors a clearer picture of the common paths patients take during their medical journey.

What this means for you:
Most people with low iron have normal results or minor issues like stomach irritation during an endoscopy.

Study Details

Study typeMeta analysis
Sample sizen = 9,807
EvidenceLevel 1
Follow-up216.0 mo
PublishedJul 2026
View Original Abstract ↓
OBJECTIVE: Gastrointestinal pathology is a major cause of iron deficiency anemia (IDA). While previous studies have focused on establishing the prevalence of malignant gastrointestinal disease, the prevalence of nonmalignant gastrointestinal disease in patients with IDA has not been analyzed systematically. We performed a systematic review and meta-analysis to determine the prevalence of normal findings, individual nonmalignant findings, and malignancy in patients with IDA. METHODS: We searched Medline, Embase, and Scopus from inception for observational studies that reported the prevalence of individual upper and lower gastrointestinal pathologies among adults (≥18 years) with confirmed IDA who underwent endoscopic investigation. We also sought to establish the prevalence of normal endoscopic findings within the IDA population as well as the prevalence of nonmalignant and malignant gastrointestinal pathology amongst clinically relevant subgroups. Results were synthesized using a random effects meta-analysis. RESULTS: A total of 8563 citations were screened, and 39 articles were included from four continents, comprising 9807 patients with IDA. Overall, the most prevalent upper gastrointestinal finding was Helicobacter pylori gastritis (27.0%), and the most prevalent lower gastrointestinal finding was hemorrhoids (10.0%). The overall prevalence of upper gastrointestinal malignancy was 5.0%, and the prevalence of colorectal cancer was 8.0%. A total of 52.0% of upper gastrointestinal endoscopies and 66.0% of lower gastrointestinal endoscopies did not detect any abnormalities. CONCLUSION: The estimated prevalence of individual malignant and nonmalignant gastrointestinal disease will serve as a guide in the context of clinical decision making before endoscopy in patients with IDA. Further population-based studies are needed, particularly among relevant subgroups.
Free Newsletter

Clinical research that matters. Delivered to your inbox.

Join thousands of clinicians and researchers. No spam, unsubscribe anytime.