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Neutropenia

Management of severe infection risk associated with low neutrophil counts.

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Hematoloji department. Book Appointment →

What is Neutropenia?

Neutropenia is defined as an absolute neutrophil count (ANC) below 1,500/microliter, with severity stratified as mild (1,000-1,500), moderate (500-1,000), and severe (less than 500). Neutrophils are the most abundant white blood cells and form the body's first line of defense against bacterial and fungal infections through phagocytosis and rapid migration to sites of infection.

Causes are categorized as decreased production (chemotherapy, radiation, aplastic anemia, leukemia, vitamin deficiency, drugs), increased destruction (autoimmune neutropenia, hypersplenism), or marginal pooling (sepsis-induced demargination). Drug-induced neutropenia is common with chemotherapy but also occurs with antibiotics, antithyroid agents, antipsychotics, and many other medications.

Infection risk increases dramatically as ANC drops below 500/μL and approaches 100% with prolonged severe neutropenia. Pathogens include normal flora that become invasive: gram-positive cocci (especially in catheter-related infections), gram-negative rods (Pseudomonas), and fungi (Candida, Aspergillus). Febrile neutropenia is an oncologic emergency requiring immediate empiric antibiotics. Prevention strategies include G-CSF prophylaxis and antimicrobial prophylaxis in selected patients.

Symptoms

Often asymptomatic when isolated (no infection)
Fever as the primary manifestation when infection develops
Mouth ulcers or gingivitis (oral mucosal involvement)
Sore throat or pharyngitis
Skin or perianal infection
Recurrent or unusual infections
Sepsis or septic shock in severe cases
Symptoms of underlying cause (chemotherapy, autoimmune disease)

Risk Factors

Recent cytotoxic chemotherapy (most common cause)
Hematologic malignancies (leukemia, MDS, lymphoma)
Hematopoietic stem cell transplantation
Drug-induced: clozapine, methimazole, sulfasalazine, ticlopidine
Viral infections (HIV, hepatitis, EBV, CMV)
Autoimmune diseases (lupus, rheumatoid arthritis)
Vitamin B12, folate, copper deficiency
Congenital/inherited neutropenia syndromes (Kostmann, cyclic neutropenia)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • ANY fever in a known neutropenic patient — emergency
  • Persistent or recurrent infections
  • Mouth ulcers or perianal pain in chemotherapy patients
  • New medication started with subsequent infection signs
  • Family history of recurrent infections from infancy
  • Routine blood test showing low neutrophils
  • Severe neutropenia (ANC under 500) without obvious cause
  • Patient education for infection prevention during chemotherapy cycles

Treatment Methods

01
Treat underlying cause: stop offending drug, treat infection, manage hematologic disorder
02
Empiric antibiotics for febrile neutropenia: piperacillin-tazobactam, cefepime, or meropenem within 1 hour
03
Vancomycin: add for catheter infection or hemodynamic instability
04
Antifungal therapy: voriconazole or echinocandin if persistent fever
05
Granulocyte colony-stimulating factor (G-CSF, filgrastim, pegfilgrastim): primary or secondary prophylaxis after chemotherapy
06
Antimicrobial prophylaxis: fluoroquinolone for high-risk patients, fluconazole/posaconazole for fungal prevention
07
Patient education: hand hygiene, food safety, avoiding sick contacts, fever monitoring
08
Allogeneic stem cell transplantation: for severe congenital neutropenia and selected severe acquired cases

Which Department to Visit?

You can visit our Hematoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Hematoloji Department

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You can make an appointment with our specialists or contact us for your concerns.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.