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PubMed This is a summary of 31 peer-reviewed journal articles Updated
Oncology

What Conditions Mimic Acute Myeloid Leukemia?

At a Glance

While severe vitamin deficiencies, tick-borne illnesses, and viral infections can cause severe drops in blood counts that mimic acute myeloid leukemia (AML), doctors use bone marrow biopsies, flow cytometry, and genetic testing to definitively confirm an accurate cancer diagnosis.

In this answer

4 sections

01

Severe Vitamin Deficiencies

02

Severe Viral Infections

03

Tick-Borne Illnesses

04

How Doctors Know for Sure

It is completely understandable to wonder if an acute myeloid leukemia (AML) diagnosis could be a mistake. Several non-cancerous conditions can mimic the signs and symptoms of AML, leading to dangerously low blood counts—a condition called pancytopenia (a severe drop in red cells, white cells, and platelets) [1]. Severe vitamin deficiencies, certain tick-borne illnesses, and intense viral infections can all cause fatigue, easy bleeding, and abnormal blood work that initially looks very similar to leukemia [2][3][4]. However, oncologists use advanced testing on the bone marrow you likely just had biopsied to definitively tell the difference between these benign mimics and true AML [5].

Severe Vitamin Deficiencies

A profound lack of vitamin B12 or folate can cause a condition so similar to leukemia that doctors sometimes call it “pseudoleukemia” [6]. When your body lacks these essential nutrients, it cannot produce healthy blood cells properly. This leads to a severe drop in blood counts [2][7].

In a severe vitamin B12 deficiency, blood tests often show high levels of an enzyme called LDH (lactate dehydrogenase) and high bilirubin, which are also commonly elevated in AML [6][8]. The bone marrow may even look packed with abnormal cells. However, the cells in a vitamin deficiency are poorly formed and look unusually large because they lack nutrients, not because they are cancerous [5][9].

Severe Viral Infections

Certain powerful viruses can overwhelm the immune system and mimic acute leukemia.

  • Mononucleosis viruses: Severe infections with Epstein-Barr virus (EBV) or cytomegalovirus (CMV) can cause dangerously low blood counts [10][11]. These viruses also cause the body to produce atypical lymphocytes (highly reactive immune cells fighting the infection) that can look remarkably like leukemia cells under a standard microscope [4][12].
  • HIV: Human immunodeficiency virus can interfere with bone marrow function, causing abnormal cell growth and low blood counts that strongly resemble a blood cancer or bone marrow failure syndrome [13][14].

Tick-Borne Illnesses

While Lyme disease rarely causes leukemia-like symptoms [15], other tick-borne infections like Ehrlichiosis and Anaplasmosis certainly can [16][17]. These infections can cause high fevers, dangerously low blood counts, and the appearance of abnormal circulating cells that are easily confused with leukemic cells [3][18].

How Doctors Know for Sure

Because these mimics look so much like AML from the outside, a regular blood draw is not enough to make a final diagnosis. Doctors use a bone marrow biopsy (extracting a small sample of liquid and bone from the hip) alongside advanced laboratory tests to be completely certain [5][19]. You can often find sections labeled “Flow Cytometry”, “Cytogenetics”, or “Molecular Profile” on your pathology report to see exactly which tests your team used [20][21].

  • Counting the Blasts: AML is typically diagnosed by finding 20% or more blasts (immature, cancerous white blood cells) in the bone marrow or blood [19][22]. (In some cases, doctors can diagnose AML with fewer blasts if they find certain aggressive leukemia-specific genetic mutations [23]). Vitamin deficiencies and infections may cause an increase in immature cells, but even in the exceptionally rare cases where this number is high, the following advanced tests will definitively prove it is not cancer [24].
  • Flow Cytometry: This highly advanced test acts like a barcode scanner for cells. It looks for specific proteins on the outside of the cells to identify exactly what they are [20][25]. Flow cytometry can prove that the unusual cells are just reactive immune cells fighting a virus, rather than true myeloid leukemia cells [26][27]. It also spots “leukemia-associated immunophenotypes,” which are abnormal protein patterns found on cancer cells but not in vitamin deficiencies [28][29].
  • Genetic Testing: Cancer is driven by acquired genetic mutations. Doctors analyze the bone marrow for specific genetic markers (like NPM1 or FLT3 mutations) that exist in AML cells [21][23]. A severe infection or vitamin deficiency will not cause these specific cancer-driving mutations [21].

While hoping for a misdiagnosis is a normal part of processing this news, once a bone marrow biopsy, flow cytometry, and genetic testing are complete, a false-positive AML diagnosis is exceptionally rare [30][31].

Common questions in this guide

Can a severe vitamin deficiency look like leukemia?
Yes, a profound lack of vitamin B12 or folate can cause a severe drop in blood counts and abnormal cells that mimic leukemia. Doctors use bone marrow biopsies and advanced tests to distinguish these poorly formed cells from true cancer cells.
What infections can be mistaken for acute myeloid leukemia?
Intense viral infections like Epstein-Barr virus, CMV, or HIV, as well as tick-borne illnesses like Ehrlichiosis, can cause dangerously low blood counts and abnormal immune cells that initially look similar to leukemia.
How do doctors confirm my AML diagnosis is not just a severe infection?
Doctors use a bone marrow biopsy combined with flow cytometry and genetic testing to confirm cancer. These advanced tests look for specific cancer proteins and genetic mutations that are completely absent in severe infections.
What role does flow cytometry play in diagnosing AML?
Flow cytometry acts like a barcode scanner for your cells. It identifies specific proteins on the outside of the cells to prove whether they are cancerous leukemia cells or just highly reactive immune cells fighting off an illness.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Can you walk me through the flow cytometry or genetic test results that confirmed my AML and definitively ruled out a severe infection?
  2. 2.Did my bone marrow biopsy show 20% or more blast cells, or was my diagnosis based on specific genetic mutations?
  3. 3.Were specific leukemia-associated mutations (like NPM1 or FLT3) found in my bone marrow cells?
  4. 4.Have we checked my vitamin B12 and folate levels to ensure a deficiency isn't making my low blood counts even worse?
  5. 5.Based on my initial symptoms, is there any reason to test for co-infections like tick-borne illnesses or viral infections?

Questions For You

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

Related questions

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References

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This page is for informational purposes only and does not replace professional medical advice. A bone marrow biopsy and advanced laboratory testing are required for an accurate AML diagnosis; always consult your oncologist.

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