Absolute eosinophil count (cord blood)

This test measures the absolute number of eosinophils, a type of white blood cell, in a sample of umbilical cord blood collected at delivery. Eosinophils help your baby’s immune system respond to allergens, parasites, and certain infections.

An automated hematology analyzer counts and classifies the cells, providing an absolute eosinophil count as part of a complete blood count with differential for newborns. Because the sample is cord blood, the result reflects conditions around the time of birth.

Eosinophil counts can give clues about inflammation, allergic conditions, parasitic exposure, medication effects, and, less commonly, specific blood disorders. In newborns, the value can also be influenced by maternal health, labor and delivery factors, and early life adaptation.

Your baby’s care team may order this test as part of routine cord blood testing or when assessing rashes, breathing symptoms, suspected infection, or other concerns soon after birth. Interpreting the eosinophil count alongside other blood cell results helps guide whether further evaluation is needed.

Your baby’s result is compared with a newborn reference interval specific to the first days of life. A value above the expected range can be temporary and related to normal adjustment after birth, allergic tendencies, maternal conditions, medications, or infection. A value below the expected range is often not worrisome by itself but may matter if other blood counts or symptoms are also unusual.

Discuss the result with your baby’s clinician, who will consider the overall clinical picture. If needed, follow‑up may include repeat testing after a short interval, a review of maternal and newborn medications and exposures, or targeted evaluations for infection, allergies, or other causes.