Age Groups at Greatest Risk for Iron Deficiency Anemia
Infants aged 9-23 months and women of reproductive age (particularly adolescent girls and women of childbearing age) are at greatest risk for iron deficiency anemia, with toddlers aged 1-2 years showing prevalence rates of 9% for iron deficiency and 3% for iron deficiency anemia, while adolescent girls and women of childbearing age demonstrate 9-11% prevalence of iron deficiency and 2-5% prevalence of iron deficiency anemia. 1, 2
High-Risk Pediatric Age Groups
Infants and Toddlers (9-23 months)
Infants aged 9-12 months represent the first critical window, with CDC guidelines mandating universal screening for all high-risk infants at this age, followed by repeat screening at 15-18 months 1, 3.
Children aged 6-23 months have 19% higher odds of iron deficiency anemia compared to older children (AOR = 1.19,95% CI [1.08-1.33]) 4.
Among toddlers aged 1-2 years, 9% have iron deficiency and 3% have iron deficiency anemia, representing approximately 700,000 affected toddlers in the United States 2.
Preterm and low-birthweight infants face even earlier risk, requiring screening before 6 months of age if not receiving iron-fortified formula 1, 3.
Early Childhood (2-5 years)
Children aged 2-5 years require annual risk assessment and screening only when specific risk factors are present 1, 3.
Iron deficiency prevalence drops to approximately 7% in this age group among those without specific risk factors 2.
Hispanic toddlers show disproportionately high rates, with 12% prevalence compared to 6% in white and Black children, largely attributable to higher rates of overweight status and lack of day care attendance 5.
High-Risk Adult Age Groups
Adolescent Girls and Women of Reproductive Age (15-49 years)
Adolescent girls and women of childbearing age demonstrate 9-11% prevalence of iron deficiency and 2-5% prevalence of iron deficiency anemia, affecting approximately 7.8 million women in the United States 2.
Non-pregnant females of reproductive age show 38.3% prevalence of non-anemic iron deficiency and 13.1% prevalence of iron deficiency anemia in recent Canadian data, with most cases (55.6%) showing normal mean corpuscular volumes 6.
Pregnant women face the highest risk during the third trimester, with iron deficiency affecting up to 84% based on data from high-income countries 7.
Adolescents (12-16 years)
Adolescents aged 12-16 years show the highest prevalence among all pediatric age groups at 4.7% for iron deficiency 1.
Overweight adolescents in this age group demonstrate 9.1% prevalence of iron deficiency, nearly double the rate of normal-weight peers 8.
Males aged 11-14 years represent a brief window of increased risk, though iron deficiency remains predominantly a female problem after childhood 9.
Lower-Risk Age Groups
School-Age Children (5-12 years)
Iron deficiency occurs in no more than 7% of older children, with CDC guidelines recommending only selective screening based on documented risk factors 1, 2.
Universal screening is not recommended for this age group without specific risk factors such as history of iron deficiency anemia, special health-care needs, or documented low iron intake 3.
Older Adults (>50 years)
Iron deficiency occurs in no more than 7% of those older than 50 years in the general population 2.
When iron deficiency anemia occurs in adults over age 50, approximately one-third have underlying bleeding abnormalities, with one-third of these proving to be cancer, necessitating endoscopic investigation even without other symptoms 10.
Key Risk Modifiers Across Age Groups
Socioeconomic and Demographic Factors
Low-income status significantly increases risk, with children from the poorest households showing 27% higher odds of iron deficiency anemia (AOR = 1.27,95% CI [1.08-1.50]) 4.
Patients in the lowest income quintile have the highest odds of anemia but the lowest odds of being screened, highlighting inequitable access to diagnosis 6.
Nutritional and Physiologic Factors
Overweight children aged 2-5 years show 20% prevalence of iron deficiency compared to 7% in normal-weight toddlers, with overweight status conferring 2.3 times higher odds (OR: 2.3; 95% CI: 1.4-3.9) 8, 5.
Children consuming >24 oz of cow's milk daily require screening at 9-12 months and 15-18 months 1.
Breast-fed infants without adequate iron supplementation after 6 months represent a high-risk group requiring targeted screening 1, 3.
Common Clinical Pitfalls
Delaying the first screen until 12 months for high-risk infants misses the critical 9-12 month window emphasized by CDC guidelines 3.
Missing the follow-up screen at 15-18 months overlooks children who develop iron deficiency after the initial test 3.
Relying solely on mean corpuscular volume misses 55.6% of iron deficiency anemia cases that present with normal MCV 6.
Failing to screen preterm/low-birthweight infants before 6 months deprives the highest-risk group of early detection 3.
Assuming school-age children and teenage boys are low-risk without assessing for specific risk factors such as special health-care needs or documented low iron intake 1, 3.