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Mononucleosis-Like Syndrome
Aka: Mononucleosis-Like Syndrome, Mononucleosis Differential Diagnosis, Mononucleosis Diagnostic Approach- See Also
- Differential Diagnosis: Mononucleosis-Like Syndromes
- Presentations most common to Mononucleosis
- See Pharyngitis
- See Fatigue Causes
- Viruses
- Epstein-Barr Virus (EBV): Most common cause
- Cytomegalovirus (CMV)
- Rubella
- Adenovirus
- Acute Viral Hepatitis
- Human Herpesvirus 6
- Acute Retroviral Syndrome (Acute HIV Infection)
- Parasites
- Bacteria
- Medications
- Dilantin
- Azulfidine
- Dapsone
- Serum-sickness type Drug Reaction
- Miscellaneous Causes
- Diagnosis: Acute Mononucleosis Syndrome
- Step 1: Monospot Test Positive
- Diagnose Epstein-Barr Virus
- Step 2: Complete Blood Count with differential
- Evaluate for >10% Atypical lymphocytes
- Lymphocytosis >50% and Atypical lymphocytes >10% may be sufficient alone to diagnose Mononucleosis without further testing
- Test Sensitivity: 75%
- Test Specificity: 92%
- Step 3a: Obtain HIV Test if <10% Atypical lymphocyte
- See Acute Retroviral Syndrome for testing
- Step 3b: Obtain EBV IgM if >10% Atypical lymphocytes
- EBV IgM Positive: Diagnose Epstein-Barr Virus
- EBV IgM Negative: Go to Step 4
- Step 4: Obtain CMV IgM
- CMV IgM Positive: Diagnose CMV-Induced Mononucleosis
- CMV IgM Negative: Evaluate for differential diagnosis
- Toxoplasmosis
- Acute Viral Hepatitis
- Human Herpesvirus 6
- References
- Step 1: Monospot Test Positive