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PubMed This is a summary of 18 peer-reviewed journal articles Updated
Hematology

Diagnosis & The Bone Marrow Workup

At a Glance

Pure red-cell aplasia is diagnosed by confirming anemia with a very low reticulocyte count, then using a bone marrow biopsy to show near-total absence of red-cell precursors while white-cell and platelet production is preserved. Further tests look for the cause.

Because Pure Red-Cell Aplasia (PRCA) is rare, getting a definitive diagnosis requires a highly specific set of tests to look at both your circulating blood and the “factory” where that blood is made. Doctors must first confirm that your red blood cell production has stalled and then determine if an underlying secondary cause is responsible [1][2].

The Blood Work (CBC and Reticulocytes)

The first step is a Complete Blood Count (CBC). In PRCA, the results typically show:

  • Normocytic Anemia: Your red blood cells are normal in size and color, but there simply aren’t enough of them [1].
  • Severe Reticulocytopenia: This is the most critical lab value. Reticulocytes are “teenager” red blood cells. In PRCA, the absolute reticulocyte count is usually very low (often less than 10,000/µL or 10 × 10⁹/L) [3][4]. A normal count would be much higher as the body tries to compensate for anemia; a low count means the marrow isn’t producing new cells [5].
  • Normal White Cells and Platelets: Unlike other bone marrow failures, your infection-fighting cells and clotting cells generally remain at healthy levels [4].

The Bone Marrow Biopsy

To confirm PRCA, a hematologist must look at a sample of your bone marrow under a microscope. During this procedure, a small needle is used to extract fluid and tissue from your hip bone after local anesthesia is applied. The pathologist is looking for a specific pattern:

  • Erythroid Aplasia: A near-total absence of erythroid precursors, which are the “baby” cells that grow into red blood cells [2][6].
  • Preserved Granulopoiesis: This technical term means the production of white blood cells is continuing [7].
  • Preserved Megakaryopoiesis: This means the production of platelets is continuing [7].

The Secondary Cause Checklist

Once PRCA is confirmed, your care team must act to find out why it happened. A typical specialist evaluation for an adult may include:

  1. Parvovirus B19 Testing: A common virus that can “freeze” red cell production. Doctors use a PCR test alongside IgG/IgM serology to look for the virus, as standard antibody tests alone can be unreliable in immunocompromised patients [8][9].
  2. Chest CT Scan: This is done to look for a thymoma, a tumor of the thymus gland that is associated with some PRCA cases [10][11].
  3. T-cell Flow Cytometry and Clonality: To evaluate for Large Granular Lymphocytic (LGL) Leukemia. Diagnosis generally requires integration of the blood smear, flow cytometry phenotype, and often T-cell-receptor clonality testing to confirm a persistent clonal population [12][4].
  4. Medication Review: Certain drugs, including some used for kidney disease (like ESAs) or seizures, can trigger an immune reaction against red cells [13][14].

Genetic Testing in Children

If PRCA is suspected in an infant or child, the evaluation includes broader genetic considerations:

  • Ribosomal Protein Gene Panel: Testing for mutations in specific genes that are responsible for Diamond-Blackfan Anemia (DBA) [15][16].
  • Phenotype-Directed Testing: If the child has other specific features like early strokes, vasculitis, or unusual rashes, the doctor may test for ADA2 deficiency [17][18]. A broader inherited marrow-failure panel and genetic counseling are recommended for pediatric-onset disease.

Common questions in this guide

What blood count pattern points to pure red-cell aplasia?
Pure red-cell aplasia usually causes normocytic anemia and severe reticulocytopenia, meaning the blood has very few newly made red blood cells. The absolute reticulocyte count is often below 10,000 per microliter, while white blood cell and platelet counts are generally preserved.
What can a bone marrow biopsy show in PRCA?
The biopsy typically shows a near-total absence of erythroid precursors, the young cells that develop into red blood cells. Production of white blood cells and platelets is usually preserved, a pattern that supports pure red-cell aplasia.
Why are Parvovirus B19 tests part of the PRCA workup?
Parvovirus B19 can temporarily stop red blood cell production and may be a secondary cause of pure red-cell aplasia. Doctors may combine PCR with IgG and IgM antibody tests because antibody results can be less reliable in people with weakened immune systems.
What other tests can identify the cause of pure red-cell aplasia?
Depending on your history, evaluation may include a chest CT for thymoma, flow cytometry and T-cell receptor clonality testing for large granular lymphocytic leukemia, and a detailed medication review. These tests help look for associated tumors, blood disorders, infections, or drug triggers.
Can a medication trigger pure red-cell aplasia?
Some medications, including erythropoiesis-stimulating agents used in kidney disease and some anti-seizure drugs, can trigger an immune reaction that stops red blood cell production. Tell your clinician about every medication and do not stop a prescribed drug without medical guidance.
Does the diagnostic workup differ for a child with PRCA?
Yes. Children may need genetic testing for Diamond-Blackfan anemia, ADA2 deficiency when features such as early strokes, vasculitis, or unusual rashes are present, and other inherited marrow-failure conditions. Genetic counseling may also be recommended.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is my absolute reticulocyte count, and is it below the typical threshold for PRCA?
  2. 2.Does my marrow report show 'preserved granulopoiesis and megakaryopoiesis,' confirming my white cell and platelet production is healthy?
  3. 3.Has a CT scan of my chest been scheduled to check for a thymoma?
  4. 4.Have we run a PCR test for Parvovirus B19 alongside the standard antibody tests?
  5. 5.Based on my age and symptoms, do we need to do a broader genetic panel or check for T-cell clonality?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (18)
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    Refractory anemia in human immunodeficiency virus: Expect the unexpected.

    Mirgh SP, Mishra VA, Shah VD, Sorabjee JS

    Journal of family medicine and primary care 2016; (5(3)):727-729 doi:10.4103/2249-4863.197288.

    PMID: 28217621
  2. 2

    Hepatitis C Infection Associated with Acquired Pure Red Cell Aplasia.

    Teague D, Gurnari C, Awada H, et al.

    Tropical medicine and infectious disease 2022; (8(1)) doi:10.3390/tropicalmed8010008.

    PMID: 36668915
  3. 3

    A nomogram model for predicting the efficacy of cyclosporine in patients with pure red cell aplasia.

    Yang L, Niu H, Zhang T, et al.

    Annals of hematology 2024; (103(6)):1877-1885 doi:10.1007/s00277-024-05636-9.

    PMID: 38308019
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    Pure red cell aplasia.

    Means RT

    Hematology. American Society of Hematology. Education Program 2016; (2016(1)):51-56 doi:10.1182/asheducation-2016.1.51.

    PMID: 27913462
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    Adult pure red cell aplasia at Universitas Academic Hospital, Bloemfontein, South Africa: A 9-year review.

    Thibile S, Barrett C, Potgieter S, et al.

    South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 2022; (112(9)):753-759 doi:10.7196/SAMJ.2022.v112i9.16416.

    PMID: 36214038
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    Pure Red Cell Aplasia Encountered in a Tertiary Care Hematology Laboratory: A Series of Nine Distinctive Cases.

    Kala M, Das K, Baveja A, et al.

    Journal of laboratory physicians 2023; (15(2)):316-320 doi:10.1055/s-0042-1757584.

    PMID: 37323590
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    Clinical heterogeneity and outcome of acquired PRCA: a multicenter European study.

    Versino F, Michel M, Vidler J, et al.

    Blood advances 2026; (10(15)):5285-5292 doi:10.1182/bloodadvances.2025019525.

    PMID: 42200581
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    Parvovirus B19: A Rare Cause of Post-renal Transplant Anemia.

    Ahmed W, Dogar RUH, Acharya S

    Journal of the College of Physicians and Surgeons--Pakistan : JCPSP 2017; (27(12)):785-787 doi:2775.

    PMID: 29185410
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    Development of pure red cell aplasia by transmission and persistent infection of parvovirus B19 through a kidney allograft.

    Inoue D, Oda T, Iwama S, et al.

    Transplant infectious disease : an official journal of the Transplantation Society 2021; (23(1)):e13462 doi:10.1111/tid.13462.

    PMID: 32897628
  10. 10

    Pure red cell aplasia and seronegative myasthenia gravis in association with thymoma.

    Lee SY, Gill A, Jung SM

    Journal of community hospital internal medicine perspectives 2020; (10(3)):238-241 doi:10.1080/20009666.2020.1770019.

    PMID: 32864051
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    Pure Red Cell Aplasia as an Isolated Paraneoplastic Manifestation of Thymoma: A Case Report and Literature Review.

    Amer H, Alajlani M, Jamle MR, et al.

    Clinical case reports 2026; (14(6)):e72888 doi:10.1002/ccr3.72888.

    PMID: 42290819
  12. 12

    T cell clonal expansion and STAT3 mutations: a characteristic feature of acquired chronic T cell-mediated pure red cell aplasia.

    Kawakami F, Kawakami T, Yamane T, et al.

    International journal of hematology 2022; (115(6)):816-825 doi:10.1007/s12185-022-03310-2.

    PMID: 35275353
  13. 13

    Successful Treatment of Antibody-mediated Pure Red Cell Aplasia Induced by Continuous Erythropoietin Receptor Activator with Prednisolone.

    Okahashi N, Kubo M, Hoshino E, et al.

    Internal medicine (Tokyo, Japan) 2022; (61(14)):2209-2213 doi:10.2169/internalmedicine.8823-21.

    PMID: 34980800
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    Emtricitabine-induced pure red cell aplasia.

    Manickchund N, du Plessis C, John MA, et al.

    Southern African journal of HIV medicine 2019; (20(1)):983 doi:10.4102/sajhivmed.v20i1.983.

    PMID: 31616574
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    The Genetic Landscape of Diamond-Blackfan Anemia.

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    The Diverse Genomic Landscape of Diamond-Blackfan Anemia: Two Novel Variants and a Mini-Review.

    Pelagiadis I, Kyriakidis I, Katzilakis N, et al.

    Children (Basel, Switzerland) 2023; (10(11)) doi:10.3390/children10111812.

    PMID: 38002903
  17. 17

    Infantile Pure Red Cell Aplasia Secondary to Deficiency of Adenosine Deaminase2 (DADA2) Syndrome-Time to Think Beyond Diamond Blackfan Anemia.

    Nayak AR, Dass J, Parikh H, et al.

    Pediatric blood & cancer 2025; (72(6)):e31656 doi:10.1002/pbc.31656.

    PMID: 40095445
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    Deficiency of Adenosine Deaminase 2: Clinical Manifestations, Diagnosis, and Treatment.

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This page is for informational purposes only and does not constitute medical advice about pure red-cell aplasia. Your hematologist and care team should interpret your blood counts, marrow findings, and test results.

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