Table 1.
Representative infectious disease tests, laboratory studies and autoimmune serologies during hospitalisation for fever of unknown origin workup
| Infectious tests | |
| HIV | Negative |
| Hepatitis A IgM | Negative |
| Hepatitis B surface antigen | Negative |
| Hepatitis B core IgM | Negative |
| Hepatitis C Ab | Negative |
| Blood Cultures × 3 | Negative |
| CSF gram stain, bacterial/fungal culture | Negative |
| CSF studies: WNV, cryptococcus, EBV, CMV, arbovirus | Negative |
| Stool Studies: Clostridium difficile toxin, culture, O&P, Shiga | Negative |
| Sputum culture, AFB smear, Streptococcus pneumoniae/legionella urine Ag | Negative |
| Urine culture | Negative |
| Malaria blood smear | Negative |
| Dengue fever panel | Negative |
| Laboratory investigations/autoimmune serologies | |
| ANA | Negative |
| ENA panel | Negative |
| Rheumatoid factor | Negative |
| Anti-CCP Abs | Negative |
| ANCA panel | Negative |
| ESR | 55 mm/hour (0–20 mm/hour) |
| CRP | 110.71 mg/L (<8.0 mg/L) |
| TSH | 2.63 uU/ml (0.46–4.68) |
| Uric acid | 6.0 mg/dL |
| WBC | 25.5 (3.4–9.6) |
| Absolute neutrophils | 15.6 (1.4–6.5) |
| Absolute lymphocytes | 0.6 (1.2–3.4) |
| Haemoglobin/haematocrit | 12.5/36.1 |
| Platelets | 125 (135–317) |
| AST | 68 U/L (8-48) |
| ALT | 82 U/L (7-55) |
| Ferritin | 5671 ng/mL (22-322) |
AFB, Acid Fast Bacillus; ALT, Alanine Aminotransferase; ANA, Anti-nuclear Antibody; ANCA, Antineutrophil Cytoplasmic Antibodies; AST, Aspartate Aminotransferase; CCP, Cyclic Citrullinated Peptide; CMV, Cytomegalovirus; CRP, C Reactive Protein; CSF, Cerebrospinal Fluid; EBV, Epstein-Barr Virus; ENA, Extractable Nuclear Antigen; ESR, Erythrocyte Sedimentation Rate; O&P, Ova & Parasites; TSH, Thyroid Stimulating Hormone; WBC, White Blood Cell; WNV, West Nile Virus.