Neftaly Fever of Unknown Origin (FUO) Workup

Thorough Investigation. Precise Diagnosis. Targeted Care.

What Is a Fever of Unknown Origin (FUO)?

A Fever of Unknown Origin (FUO) is defined as a fever higher than 38.3°C (101°F) that lasts for more than 3 weeks, with no clear diagnosis after initial testing. It is a complex medical condition that may indicate an underlying infection, inflammatory disease, malignancy, or other rare disorder.

At Neftaly, we specialize in comprehensive, evidence-based workups to uncover the root cause of prolonged, unexplained fevers—providing clarity, relief, and a personalized care plan.

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When to Consider an FUO Workup

You may need a FUO evaluation if:

• You’ve had a persistent fever for 3 weeks or longer
• Basic labs and imaging have not revealed a cause
• You’re experiencing additional symptoms (e.g., weight loss, night sweats, fatigue)
• You’re immunocompromised or have an existing chronic illness
• Multiple courses of antibiotics haven’t resolved the fever

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Neftaly’s FUO Diagnostic Process

Our methodical, step-by-step approach is designed to minimize unnecessary testing while ensuring thoroughness.

1. Comprehensive Medical History & Examination

• Detailed timeline of fever patterns and associated symptoms
• Review of recent travel, exposures, medications, medical conditions, surgeries, and immunizations

2. Baseline Laboratory Testing

• Complete blood count (CBC), ESR, CRP
• Liver and kidney function tests
• Blood cultures and urine analysis
• Serologies for common infections
• Tuberculosis screening
• HIV testing (if indicated)

3. Advanced Imaging

• Chest X-ray
• Abdominal ultrasound
• CT scan (chest/abdomen/pelvis)
• MRI or PET-CT for specific cases

4. Specialized Testing Based on Clues

• Autoimmune markers (ANA, RF, ANCA)
• Bone marrow biopsy (if hematologic disease is suspected)
• Infectious disease panels (e.g., CMV, EBV, malaria, brucellosis)
• Biopsies of affected tissues if masses, lymph nodes, or organ abnormalities are found

5. Multidisciplinary Collaboration

• Input from infectious disease specialists, rheumatologists, hematologists, or oncologists as needed
• Referral to tertiary care or academic centers for rare or complex cases

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Common Categories of FUO Causes

• Infections (e.g., endocarditis, tuberculosis, abscesses)
• Autoimmune and Inflammatory Diseases (e.g., lupus, vasculitis, adult-onset Still’s disease)
• Cancers (e.g., lymphoma, leukemia, renal cell carcinoma)
• Miscellaneous Causes (e.g., drug fever, thyroiditis, factitious fever)
• Undiagnosed (in some cases, fever resolves without a definitive diagnosis)

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Why Choose Neftaly?

• ✅ Systematic, science-driven evaluation
• ✅ State-of-the-art diagnostic tools
• ✅ Access to specialists under one roof
• ✅ Patient-centered care with clear communication throughout the process
• ✅ Supportive follow-up for unresolved or recurrent cases

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Don’t Let Uncertainty Continue

If you or your loved one is living with an unexplained fever, don’t wait. Early investigation leads to earlier answers—and better outcomes.

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Neftaly Fever of Unknown Origin Workup — Uncovering the Cause. Restoring Your Health.