Iron Deficiency Anemia Gastrointestinal Evaluation

Obtain CBC, ferritin, and transferrin saturation (TSAT) before labeling anemia as gastrointestinal blood loss. In the absence of inflammation, ferritin is the most specific marker: ferritin below 15 µg/L indicates absent iron stores, and values below 30 µg/L generally indicate low body iron stores. A ferritin threshold of 30 µg/L has reported sensitivity of 92% and specificity of 98% for iron deficiency. BMJ+1BMJBritish Society of Gastroenterology guidelines for the ... - GutASHManagement of iron deficiency | Hematology, ASH Education Program

Do not exclude iron deficiency solely because ferritin is not low in chronic inflammatory conditions. Ferritin is an acute-phase reactant; in chronic heart failure, chronic kidney disease, or inflammatory bowel disease, ferritin below 100 µg/L or TSAT below 20% can support iron deficiency. In chronic inflammatory conditions, TSAT below 20% is commonly used to identify patients likely to benefit from iron replacement. Wiley+1WileyLimitations of Serum Ferritin in Diagnosing Iron Deficiency in ...ASHDiagnosis and management of iron deficiency in chronic ...

A microcytic, hypochromic anemia with a low absolute reticulocyte count and ferritin below 15 µg/L is the classic pattern of absolute iron deficiency. When ferritin is equivocal, low TSAT, reticulocyte hemoglobin, soluble transferrin receptor, percentage hypochromic red cells, or red-cell zinc protoporphyrin can strengthen the diagnosis and prevent unnecessary invasive gastrointestinal testing for a non–iron-deficient anemia. BMJ+1BMJBritish Society of Gastroenterology guidelines for the ... - GutASHAcquired underproduction anemias: anemias in the setting of ...

Iron deficiency anemia often reflects chronic occult gastrointestinal bleeding, particularly in adult men and postmenopausal women. Grossly normal stool does not exclude clinically important blood loss: patients losing approximately 100 mL of blood daily may have no visible stool change. PubMedPubMedAGA Technical Review on Gastrointestinal Evaluation of Iron Deficiency Anemia - PMC

Melena, hematochezia, recurrent overt bleeding, hemodynamic instability, or transfusion requirement should be managed as gastrointestinal bleeding rather than as routine outpatient iron deficiency anemia. In patients with negative initial endoscopic assessment and instability or transfusion need, capsule endoscopy has been completed within 48 hours in emergency evaluations, but this is a distinct obscure-bleeding pathway rather than the default workup for uncomplicated anemia. ScienceDirectScienceDirectFactors Associated With Positive Findings From Capsule Endoscopy in Patients With Obscure Gastrointestinal Bleeding - ScienceDirect

Do not use fecal occult blood testing to decide whether an iron-deficient adult merits evaluation. Occult bleeding and iron deficiency anemia lie on a spectrum of intermittent or chronic bleeding from benign or malignant gastrointestinal lesions, and anemia may be the only presenting manifestation. ScienceDirect+1ScienceDirectAmerican Gastroenterological Association medical position statement: Evaluation and management of occult and obscure gastrointestinal bleedingPubMedAGA Technical Review on Gastrointestinal Evaluation of Iron Deficiency Anemia - PMC

Refer adult men and postmenopausal women with confirmed iron deficiency anemia for upper and lower gastrointestinal endoscopy unless a competing explanation clearly outweighs procedural benefit. These groups have a high risk of bleeding gastrointestinal lesions, and adult male and postmenopausal iron deficiency anemia is frequently attributable to chronic occult gastrointestinal bleeding. Wiley+1WileyRecommendations for diagnosis, treatment, and prevention of iron deficiency and iron deficiency anemia - Iolascon - 2024 - HemaSphere - Wiley Online LibraryPubMedAGA Technical Review on Gastrointestinal Evaluation of Iron Deficiency Anemia - PMC

Bidirectional endoscopy means EGD plus colonoscopy. Upper and lower endoscopy identify the cause of bleeding in approximately 70% to 80% of patients with iron deficiency anemia in the cited review literature, supporting examination of both tracts rather than symptom-directed single-site testing in higher-risk adults. ScienceDirectScienceDirectObscure gastrointestinal bleeding and iron-deficiency anemia—Where does capsule endoscopy fit? - ScienceDirect

In premenopausal women, first establish whether there is a clear non-gastrointestinal explanation. Consider bidirectional endoscopy when gastrointestinal symptoms are present, bowel habits have changed, overt bleeding occurs, there is a personal history of colorectal cancer or a first-degree relative with colorectal cancer, or no clear explanation for iron deficiency anemia exists. WileyWileyRecommendations for diagnosis, treatment, and prevention of iron deficiency and iron deficiency anemia - Iolascon - 2024 - HemaSphere - Wiley Online Library

Do not defer evaluation in a man or postmenopausal woman because iron replacement improves hemoglobin. Replacement corrects the deficit but does not exclude a bleeding lesion or malabsorptive disorder. In patients with heart failure and absolute iron deficiency, coordinate procedural necessity and safety with cardiology when endoscopic evaluation is being considered. BMJBMJBritish Society of Gastroenterology guidelines for the ... - Gut

Order celiac serology for every adult with iron deficiency anemia. Tissue transglutaminase IgA is the serologic test addressed in the AGA technical review; interpret it in the context of total IgA status when clinical suspicion remains despite negative testing. A positive result redirects the evaluation toward celiac disease as a cause of iron malabsorption and supports upper gastrointestinal assessment with appropriate diagnostic sampling. Wiley+1WileyRecommendations for diagnosis, treatment, and prevention of iron deficiency and iron deficiency anemia - Iolascon - 2024 - HemaSphere - Wiley Online LibraryGastroenterologyAGA Technical Review on Gastrointestinal Evaluation of Iron ...

Consider celiac serology even in nonanemic iron deficiency. This is particularly important when gastrointestinal symptoms are absent because iron deficiency may be the presenting consequence of reduced proximal small-bowel iron absorption. WileyWileyRecommendations for diagnosis, treatment, and prevention of iron deficiency and iron deficiency anemia - Iolascon - 2024 - HemaSphere - Wiley Online Library

Assess for Helicobacter pylori infection and autoimmune gastritis, particularly when oral iron produces an inadequate response. These disorders should be considered alongside ongoing occult blood loss after negative or nondiagnostic initial endoscopy, rather than repeatedly escalating endoscopic testing without reassessing absorption. WileyWileyRecommendations for diagnosis, treatment, and prevention of iron deficiency and iron deficiency anemia - Iolascon - 2024 - HemaSphere - Wiley Online Library

When oral iron is contraindicated, ineffective, or not tolerated, consider parenteral iron while the etiologic workup continues. Monitor for an adequate hematologic response; persistent deficiency despite replacement is an escalation trigger for reassessing adherence, ongoing blood loss, celiac disease, H. pylori, autoimmune gastritis, and the adequacy of prior endoscopic examinations. cks nice org uk+1cks nice org ukScenario: Management of iron deficiency anaemia - CKS - NICEWileyRecommendations for diagnosis, treatment, and prevention of iron deficiency and iron deficiency anemia - Iolascon - 2024 - HemaSphere - Wiley Online Library

After negative EGD and colonoscopy, determine whether iron deficiency anemia has resolved with replacement or remains persistent or recurrent. Persistent or recurrent iron deficiency anemia after negative initial endoscopy fits occult obscure gastrointestinal bleeding, for which the small bowel is the next anatomic target. ScienceDirectScienceDirectObscure gastrointestinal bleeding and iron-deficiency anemia—Where does capsule endoscopy fit? - ScienceDirect

Use video capsule endoscopy to detect small-bowel mucosal abnormalities when the small bowel is the suspected source. In older adults with iron deficiency anemia and overt obscure bleeding, angiodysplasia was the most common reported capsule finding among patients older than 85 years; erosions and ulcerations were common findings across age groups. Wolters KluwerWolters KluwerEvaluation of Iron Deficiency Anemia in Older... : Journal of Clinical Gastroenterology

Recognize factors associated with a higher likelihood of positive capsule findings: age above 60 years, previous bleeding episodes, transfusion requirement, inflammatory bowel disease, and repeat capsule evaluation after an initially nondiagnostic study. These features can justify earlier small-bowel escalation in recurrent or clinically consequential disease. ScienceDirectScienceDirectFactors Associated With Positive Findings From Capsule Endoscopy in Patients With Obscure Gastrointestinal Bleeding - ScienceDirect

Capsule endoscopy does not provide therapy. Use a positive study to direct lesion-specific enteroscopy or other targeted management rather than treating the capsule finding as an endpoint. If prior endoscopy quality or completeness was inadequate, reassess the original examinations before assigning the bleeding source to the small bowel. ScienceDirectScienceDirectObscure gastrointestinal bleeding and iron-deficiency anemia—Where does capsule endoscopy fit? - ScienceDirect