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Complete Blood Count (CBC)

Eosinophils (%)

Normal range 1–4 % of WBC (0.01–0.04 fraction SI). Specimen: Whole blood (EDTA).

Also known as: eos.

1–4 % of WBCReference range

Reference range

Conventional% of WBC
14
SIfraction
0.010.04
SpecimenWhole blood (EDTA)
Conventional range1–4 % of WBC
SI range0.01–0.04 fraction
Conversion factor×0.01 (conventional → SI)
PanelComplete Blood Count (CBC)

Convert any Eosinophils (%) result between units on the unit converter.

What is the normal range for Eosinophils (%)?

The standard teaching reference range for Eosinophils (%) is 1–4 % of WBC in conventional units, or 0.01–0.04 fraction in SI units. This value is measured in whole blood (edta).

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population — always use the range printed on the actual result.

Above the range

Common causes of a high Eosinophils (%)

  • Allergic and atopic disease
  • Parasitic infection
  • Drug reactions
  • Asthma

Below the range

Common causes of a low Eosinophils (%)

  • Acute stress
  • Corticosteroids

At the bedside

Nursing considerations

  • Think allergy, asthma, or parasites when eosinophils are elevated.

Study aid

Your notes on Eosinophils (%)

Same panel

More Complete Blood Count (CBC) tests

Absolute Neutrophil Count (ANC)2500–7000 cells/µLBasophils (%)0–1 % of WBCHematocrit (Hct)36–52 %Hemoglobin (Hgb)12–17.5 g/dLLymphocytes (%)20–40 % of WBCMean Corpuscular Hemoglobin (MCH)27–33 pg/cell