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.

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

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

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)

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

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.