A 55-year-old male visited his primary care doctor for complaints of fatigue and flu-like symptoms but no respiratory symptoms. Upon presentation, he also had a fever of 100.2° F. His history included Type 2 diabetes, which was well managed. He was otherwise healthy and relatively active. He returned two weeks ago from a camping trip in Maine.
A CBC, chemistry panel, and COVID and influenza tests were ordered. The results of the CBC were as follows:
| Patient Results | Reference Range |
| WBC | 2.3 x 103μL | 4.8 - 10.8 x 103 / μL |
| Platelets | 63,000 / μL | 150,000 - 400,00 / μL |
| Hematocrit | 38% | 42-52% |
| Differential - ABS |
| Neutrophils | 1.2 x 103 / μL | 1.4 - 6.5 x 103 / μL
|
| Lymphocytes | 0.9 x 103 / μL | 1.2 - 3.4 x 103 / μL
|
| Monocytes | 0.1 x 103 / μL | 0.11 - 0.59 x 103 / μL
|
| Eosinophils | 0.1 x 103 / μL | 0 - 0.5 x 103 / μL
|
| Basophils | 0 x 103 / μL | 0 - 0.2 x 103 / μL |
