Basophils (abs.)
Immune system healthAlso known as: absolute basophil count, ABC, basofiele granulocyten
The absolute count of basophils per liter of blood.
Basophils are the rarest type of white blood cell and play a role in allergic reactions, inflammation, and parasite defense. The absolute count provides a more accurate assessment than the percentage, especially when total white blood cell counts are abnormal.
Reference range
Source: lab benchmark
Reference ranges may vary between labs and assays. Always interpret results with your healthcare provider.
Why this matters
Basophils are your body's first responders to allergens and parasites. While they normally represent less than 1-2% of white blood cells, elevated levels can indicate allergic conditions, chronic inflammation, or certain blood disorders. Low levels are usually not concerning. When activated, basophils contribute to symptoms like itching, swelling, and respiratory changes during allergic reactions.
Monitoring helps assess allergic tendencies and inflammatory conditions.
How this connects to other biomarkers
- Absolute basophilia is rare; persistent elevation strongly suggests a myeloproliferative disease (a chronic bone-marrow disorder — CML, polycythemia vera).
- Mild elevation may be seen with underactive thyroid (high TSH) or chronic allergic inflammation.
- Low absolute basophils are clinically silent.
How often should I test Basophils (abs.)?
Most adults benefit from yearly absolute basophil count testing as part of a CBC differential. Persistent abnormalities prompt your clinician's follow-up rather than a fixed retest cadence.
At baseline / for screening: Once every 12 months from age 30 as part of a CBC with differential.
Included in
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