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Basophils are a type of white blood cell that protect your body from bacteria and parasites such as ticks. They also play a role in allergic reactions.

What might a low result mean?

Low levels of basophils can be caused allergic reactions and infections, when the levels of basophils have spiked in order to protect the body, and then been depleted afterwards.

Low levels of basophils are associated with hyperthyroidism.

What might a high result mean?

Elevated levels of basophils can be seen with bone marrow disorders, in which the body produces an excess number of blood cells. Levels can also raise due to autoimmune conditions such as rheumatoid arthritis.

Raised levels of basophils are also associated with hypothyroidism.