Oncology Questions? Ask an Oncologist for Answers ASAP
Normal WBC is 4 to 10 so yes 18.5 is very high ...
Any fever ?
Infection most common cause ...
Blood problems / marrow problems up to leukemia can be potential concern however ...
Seeking infection is first step with your results
Sed rate / C-reactive protein / urinalysis / urine culture/ chest xray or CT / sinus CT/ blood cultures / echocardiogram /
Pneumonia or kidney infection or endocarditis can cause huge elevations of WBC ( neutrophil highest )
Have you had fever ? Chills ? Night sweats ?
Any symptoms of concern?
Do you know what type cells were high ? Neutrophils, monocytes , lymphocytes ,other ?
Attention first would typically be as I mentioned to look for evidence of infection
If there is not infection as explanation for very high WBC then investigation may turn to look for blood pre-malignant or malignant conditions
SPEP = serum protein electrophoresis is used
Blood smear review by pathologist may be done
Bone marrow biopsy is done if needed ...( not first done of course on that ...Other reasons sought before resorting to that measure )