Basophils Percentage (Basophils %)

Haematology marker

Basophils Percentage

Basophils Percentage (Basophils %)

Category: Haematology
Unit: %

The proportion of white blood cells that are basophils, expressed as a percentage of the total. Basophils are the rarest white-cell type, so this value is normally very low. It is the relative differential value, distinct from the absolute basophil count.

PED Notes

The rarest white-cell line and rarely significant in isolation. A mildly raised basophil percentage is almost never meaningful on its own; persistent elevation can occasionally accompany allergic conditions, hypothyroidism, or, rarely, myeloproliferative disorders. Not affected by AAS. Interpret within the full differential.

When high

When high (>2%):

  • Mild elevation is almost never meaningful on its own; confirm with the absolute basophil count and interpret within the whole differential
  • Persistent elevation may occasionally be seen with allergic disease, hypothyroidism, or, rarely, a myeloproliferative disorder; check TSH if there are corroborating features
  • No specific supplement or lifestyle measure targets basophils directly

When low

When low (<0%, effectively absent):

  • A low or zero basophil percentage is normal and expected given how rare these cells are; it carries no clinical significance
  • No action is required

History Chart

Reading History

Frequently Asked Questions

Reference Ranges

Standard Range

0 - 2 %

Statistics