Cited by 1,219Iron Metabolism and DisordersErythropoietin and Anemia TreatmentHematological disorders and diagnostics

Anemia of inflammation

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Weiss, Guenter, Ganz, Tomas, Goodnough, Lawrence T.·2019·Blood

Abstract

Anemia of inflammation (AI), also known as anemia of chronic disease (ACD), is regarded as the most frequent anemia in hospitalized and chronically ill patients. It is prevalent in patients with diseases that cause prolonged immune activation, including infection, autoimmune diseases, and cancer. More recently, the list has grown to include chronic kidney disease, congestive heart failure, chronic pulmonary diseases, and obesity. Inflammation-inducible cytokines and the master regulator of iron homeostasis, hepcidin, block intestinal iron absorption and cause iron retention in reticuloendothelial cells, resulting in iron-restricted erythropoiesis. In addition, shortened erythrocyte half-life, suppressed erythropoietin response to anemia, and inhibition of erythroid cell differentiation by inflammatory mediators further contribute to AI in a disease-specific pattern. Although the diagnosis of AI is a diagnosis of exclusion and is supported by characteristic alterations in iron homeostasis, hypoferremia, and hyperferritinemia, the diagnosis of AI patients with coexisting iron deficiency is more difficult. In addition to treatment of the disease underlying AI, the combination of iron therapy and erythropoiesis-stimulating agents can improve anemia in many patients. In the future, emerging therapeutics that antagonize hepcidin function and redistribute endogenous iron for erythropoiesis may offer additional options. However, based on experience with anemia treatment in chronic kidney disease, critical illness, and cancer, finding the appropriate indications for the specific treatment of AI will require improved understanding and a balanced consideration of the contribution of anemia to each patient's morbidity and the impact of anemia treatment on the patient's prognosis in a variety of disease settings.

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Crossref · 10.1182/blood-2018-06-856500

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  • During infections, increased cytokine concentrations activate the production of myeloid cells important for host defense.

    “activate the production of myeloid cells important for host defense [55]”

    From Hepcidin-Ferroportin Interaction Controls Systemic Iron Homeostasis (2021) · cites this paper as [55]

    The Introduction says microbial molecules trigger inflammatory cytokine release and that IFN-γ promotes production, differentiation, and activation of leukocytes important for host defense. It does not specifically identify those cells as myeloid or establish that increased cytokine concentrations generally drive their production during infections. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Based on real-life evidence, determination of iron status by using serum ferritin and transferrin saturation is the most commonly deployed strategy used in clinical and public health settings.

    “Although many laboratory indexes may be helpful for the ID differential diagnostic workup, such as the mean corpuscular volume (MCV), the reticulocyte count and reticulocyte Hb content, the soluble transferrin receptor and its correlation with SF, and hepcidin measurement, based on the real-life evidence, the determination of iron status by using SF and TSAT is the most commonly deployed strategy”

    From Defining Global Thresholds for Serum Ferritin: A Challenging Mission in Establishing the Iron Deficiency Diagnosis in This Era of Striving for Health Equity (2025) · cites this paper as [17]

    The Introduction (page unavailable) uses transferrin saturation and serum ferritin to distinguish anemia of inflammation from iron-deficiency anemia, and discusses limitations of alternative tests. It does not establish that this is the most commonly deployed strategy, cite real-life evidence for its frequency of use, or address its use in public health settings. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • It is usual practice in many specialties and guidelines to assume that, regardless of the lower normality value of the ferritin test used, SF <30 ng/mL (irrespective of TSAT) or SF <100 ng/mL and TSAT <20% are the hallmarks of absolute iron deficiency; while SF >100 ng/mL and TSAT <20% usually indicate anemia of inflammation in the context of infection or inflammation.

    “It is a usual practice in many specialties and guidelines to assume that, regardless of the lower normality value of the ferritin test used, SF <30 ng/mL (irrespective of the TSAT value) or SF <100 ng/mL and TSAT <20% are the hallmarks of absolute ID; while SF >100 ng/mL and TSAT <20% usually indicate AI in the context of infection or inflammation [1,2,15,16,17,18,19,20].”

    From Defining Global Thresholds for Serum Ferritin: A Challenging Mission in Establishing the Iron Deficiency Diagnosis in This Era of Striving for Health Equity (2025) · cites this paper as [17]

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  • Hepcidin contributes to innate immunity by decreasing plasma iron levels, providing an iron-restricted internal milieu inhospitable to microbes.

    “Hepcidin contributes to innate immunity by decreasing plasma iron levels, providing an iron-restricted internal milieu inhospitable to microbes (6).”
  • During infections, increased cytokine concentrations inhibit erythropoiesis.

    “During infections, increased cytokine concentrations inhibit erythropoiesis”

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Authors
Weiss, G., Ganz, T., & Goodnough, L. T.
Affiliations
  • Department of Internal Medicine II and
  • University of California, Los Angeles (US)
  • Stanford Medicine (US)
Venue
Blood
Published
2019-01-03
Volume
133
Issue
1
Pages
40-50
ISSN
  • 0006-4971 (ISSN-L)
  • 1528-0020
OpenAlex
W2900365689
Cited by
1,219
References
166
Citations by year
2026: 172 · 2025: 181 · 2024: 185 · 2023: 178 · 2022: 161 · 2021: 171 · 2020: 111 · 2019: 51 · 2018: 2 · 2015: 1 · 2014: 3 · 2013: 1
FWCI
13.79
Type
journal article
Language
en
Open access
Locations
  • Blood (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (R01DK065029)
Topics
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Health Sciences › Medicine › Hematology › Erythropoietin and Anemia Treatment
  • Health Sciences › Medicine › Emergency Medicine › Hematological disorders and diagnostics
Keywords
anemia of chronic disease, hepcidin, iron homeostasis, iron limitation, erythropoiesis, cytokines, erythropoietin, erythrocyte survival, iron deficiency, hyperferritinemia, hypoferremia, erythropoiesis-stimulating agents, iron therapy, chronic kidney disease, cancer
MeSH terms
Anemia, Humans, Inflammation, Prognosis

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