Hi, I M Dr.Kumarbhargav Consultant Pathologist I understood your query, White blood cells (WBCs) fight against the infectious organisms and defend the body. It also produce, transports and distributes antibodies to various foreign antigens. Its estimation serves as usefull guide to severity to disease process. Specific pattern of increase or decrease in types of WBCs help recognize various disease. Looking to your problem, slight fever. Just wanted to know whether you have any complaints like cough, sore throat, burning micturition or any other significant complaints. Your doctor wanted to look for how much exactly the count and pattern of your complete blood count. If i would have been your doctor i would have your Complete blood count with peripheral smear examination, urine examination to look for infection by pus cells and red blood cells in urine. Would have considered the most according to your complaints and your investigative profile first. So have your tests done. follow with reports and complaints. Thanks for asking health care magic. Take care. Ask freely to clear your doubt.