Basophils

Basophils are a white blood cell biomarker. The marker is commonly abbreviated as BASO and represents basophils within measurements of white blood cells.

Basophils are measured from a whole-blood sample. Fasting is not required, so the test can be arranged without avoiding food beforehand. The key collection consideration is that the sample must be whole blood, allowing the basophil measurement to be assessed in the blood specimen rather than in another sample type.

Results are interpreted against a reference interval, with a separate optimal interval shown for this marker. The reference information also provides intervals for males and females, so the applicable interval may depend on the person’s sex. Basophils can be considered alongside related blood markers, including White Blood Cells and Eosinophils, when reviewing the result. A clinician can explain how the finding fits with the reason for testing and any other results.

A Basophils result should be read against the reference range printed on the same laboratory report. Reference ranges can differ between laboratories because reporting conventions, measurement units, and the populations used to establish the ranges may differ, so a number should not be interpreted in isolation or compared directly with a range from another report.

The optimal range is narrower than the reference range. A result within the reference range may therefore fall outside the tighter optimal range; this does not, by itself, mean that anything is wrong. The reference and optimal ranges are guides for interpretation rather than diagnoses.

A single Basophils value is only one part of assessing health and does not establish a diagnosis on its own. Results outside the report’s reference range should be discussed with a clinician, who can interpret them in the context of symptoms, medical history, and other findings.