What Is Varicella?
6. Diagnosis
If necessary, laboratory tests such as a culture of fluid from a blister or blood tests can confirm a diagnosis of chickenpox. However, this usually isn’t necessary, at least not once the rash develops. Chickenpox lesions are very distinctive, and doctors can usually identify them quickly.1https://www.mayoclinic.org/diseases-conditions/chickenpox/symptoms-causes/syc-20351282
Lab tests may be more useful if you are not sure whether you have had chickenpox in the past and are wondering whether you need to get the vaccine. If this is the case, your doctor can perform a blood test to determine whether you already have immunity.2https://www.hopkinsmedicine.org/health/conditions-and-diseases/chickenpox
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