как пример жда у детей старше 10 лет - у половины гастриты на ФГДС из-за хеликобактера, в менее 5% язвы 12-пк: к 6 летним это не относится

44 children between the ages of 9.5 and 17.5 years and diagnosed with IDA were enrolled. They underwent upper gastrointestinal endoscopy and biopsy from esophagus, stomach, and duodenum. Mean age and hemoglobin (Hb) levels of study group (32 boys, and 12 girls) were 14.6 ± 2.0 years and 7.9 ± 1.8 g/dL, respectively. Only 1 patient had a positive serology testing with anti-tissue transglutaminase and small bowel biopsy correlating with celiac disease. Endoscopy revealed abnormal findings in 25 (56.8%) patients (21 endoscopic antral gastritis, 2 active duodenal ulcers, and 2 duodenal polyps). Helicobacter pylori (HP) infection was identified by using antral histopathological evaluation in 19 of 44 children (43.2%).
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Pediatr Hematol Oncol. 2011 Nov;28(8):694-701.
Diagnostic yield of upper gastrointestinal endoscopy in the evaluation of iron deficiency anemia in older children and adolescents