--- title: "Low basophils: what they mean (nothing to treat)" type: biomarker-interpretation url: "https://www.test-well.com/biomarkers/basophils/low" biomarker: Basophils direction: low reference_range: - "age 18+: 0.000 – 2.00 %" reviewed_at: 2026-11-02 review_status: reviewed date_published: 2026-09-05 --- # Low basophils: what they mean (nothing to treat) > A low basophil count has no medical significance. Basophils normally make up 0–1% of white cells — about 0.0–0.2 × 10³/µL — so the lower limit of the reference range is zero, and a result of 0% or 0 is normal for most people on most CBCs. Cortisol suppresses basophils, so counts fall during acute infection and stress and with corticosteroids; hyperthyroidism, pregnancy and ovulation lower them slightly; and acute allergic reactions can briefly deplete them as they release their histamine. None of this is diagnosed or treated by way of the basophil count, and a low value needs no follow-up. ## When does this result need same-day care? - A low basophil count is never urgent. ## What is the normal range for Basophils? - age 18+: 0.000 – 2.00 % ## What are the common causes of low Basophils? 1. Normal variation — the reference range starts at zero, and a differential that counts a few hundred cells will often record none 2. Corticosteroids (prednisone, dexamethasone, injected or high-dose inhaled) and the stress response of acute infection, surgery or injury 3. Hyperthyroidism 4. Acute allergic reactions and hives — basophils degranulate and are briefly cleared from the blood 5. Pregnancy, ovulation, and some chemotherapy and marrow-suppressing treatments 6. Counting artifact — automated analyzers and manual differentials both struggle to count a cell this rare ## What symptoms go with low Basophils? - None — a low basophil count causes no symptoms and indicates no disease ## What do clinicians usually check next? - Nothing — a low or zero basophil count needs no follow-up - Read the rest of the CBC as usual; if neutrophils, hemoglobin or platelets are abnormal, those are the results to act on - If the total white count is also low or you are on a steroid, the explanation is already in hand - Do not repeat the test for the basophil count itself ## How do you recheck Basophils? | Test or panel | Type | Price | Fasting | Results | | --- | --- | --- | --- | --- | | [Biological Age Panel](https://www.test-well.com/tests/biological-age-panel) | Panel (3 tests) | $59.99 | Yes | 1–3 business days | | [General Wellness Panel](https://www.test-well.com/tests/general-wellness-panel) | Panel (4 tests) | $49.99 | Yes | 1–3 business days | | [Blood Clotting Panel](https://www.test-well.com/tests/blood-clotting-panel) | Panel (4 tests) | $149.99 | No | 3–7 business days | | [CBC with Differential Test](https://www.test-well.com/tests/cbc-with-differential) | Test | $17.99 | No | 1–3 business days | Plus one $6 lab processing fee per order; physician authorization included. ## Common questions ### Is a low basophil count bad? No. The normal range for basophils starts at zero, so a low or absent count is a normal result. It causes no symptoms and is not linked to any condition that needs treatment. ### What does 0% basophils mean? Nothing on its own. Basophils are so scarce — normally under 1% of white cells — that a differential frequently records none at all. Steroids, stress, infection and hyperthyroidism lower them further, but none of that is acted on through the basophil count. ### What causes low basophils? Normal variation first; then corticosteroids and the stress of acute illness, hyperthyroidism, acute allergic reactions, pregnancy and ovulation. In every case the basophil count is a bystander, not a finding. ### Can low basophils indicate hyperthyroidism? Hyperthyroidism does lower basophils slightly, but the effect is too small and too common for other reasons to be useful; TSH is checked because of symptoms, not because of a basophil count. ### Should I retest a low basophil count? No. It will appear on every future CBC and will not change what anyone does. Follow any other abnormal value instead. ### Why do labs report basophils at all? The automated differential reports all five white cell types by default. Basophils matter in one direction only — a persistent, marked increase in a myeloproliferative disorder — and the low end of the range carries no information. ## Related - [What does a high Basophils mean?](https://www.test-well.com/biomarkers/basophils/high) - [Basophils reference ranges](https://www.test-well.com/biomarkers/basophils) - [Hemoglobin reference range](https://www.test-well.com/biomarkers/hemoglobin) - [Hematocrit reference range](https://www.test-well.com/biomarkers/hematocrit) - [White Blood Cell Count reference range](https://www.test-well.com/biomarkers/white-blood-cell-count) ## Sources - [AACC Lab Tests Online](https://www.testing.com/tests/wbc-differential/) - [MedlinePlus (NIH) — Blood Differential](https://medlineplus.gov/lab-tests/blood-differential/) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-11-02. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/biomarkers/basophils/low Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.