Table 3. Laboratory Findings.
| Laboratory test | Result | Reference range (if applicable) |
|---|---|---|
| Hemoglobin | 6.7 g/dL | 12.9 - 16.1 |
| Mean corpuscular volume | 82 fL | 79.0 - 92.2 |
| White blood cell count | 18,000/µL, 70% neutrophils | 4,200 - 9,100 |
| Platelet count | 389,000/µL | 150,000 - 400,000 |
| Lactate dehydrogenase | 2,569 U/L | 140 - 271 |
| Haptoglobin | 4 mg/dL | 32 - 197 |
| Total bilirubin | 2.7 mg/dL | 0.3 - 1.9 |
| Direct | 0.84 mg/dL | ≤ 0.18 |
| Indirect | 1.86 mg/dL | 0.1 - 1.0 |
| Absolute reticulocyte count | 71,000/µL | 26,000 - 95,000 |
| Indirect antiglobulin test | Positive, no alloantibody identified | - |
| Direct antiglobulin test | - | |
| On admission | Positive, negative IgG and weakly positive complement C3 | |
| On day 3 of hospitalization | Positive, positive IgG (2+) and positive complement C3 (3+) | |
| Eluate | Non-reactive | - |
| Cold agglutinins titer | < 1:32 | - |
| Iron | 83 µg/dL | 50 - 212 |
| Ferritin | 1,076 ng/mL | 24 - 336 |
| Vitamin B12 | > 2,800 pg/mL | 180 - 914 |
| Folate | > 20 ng/mL | ≥ 5.9 |
| G6PD | 2.2 - 5.0 U/g Hgb | 7.9 - 16.3 |
| C-reactive protein | 117 mg/L | ≤ 10.0 |
| Fibrinogen | 787 mg/dL | 200 - 393 |
| D-dimer | > 5,000 ng/mL | ≤ 574 |
| Creatinine | 0.70 - 1.30 | |
| On admission | 5.56 mg/dL | |
| On day 45 | 1.15 mg/dL | |
| Serum protein electrophoresis | Negative |
G6PD: glucose-6-phosphate dehydrogenase; IgG: immunoglobulin G; Hgb: hemoglobin.