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Immunology & Autoimmune
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Currently under review
Pending specialist review and validation.
This test measures the number of monocytes, a type of white blood cell, in a sample of umbilical cord blood collected at delivery. Monocytes help your baby’s body respond to infection, clear damaged cells, and support the early immune response. The result is an absolute count reported by an automated hematology analyzer as part of a white blood cell differential.
Cord blood is drawn from the clamped umbilical cord after birth, so it does not cause discomfort to you or your baby. This measurement is often included with a newborn complete blood count to give clinicians a quick snapshot of the baby’s immune and inflammatory status right after birth.
Monocyte levels can change in the newborn period with stress, inflammation, and infection. Checking this count can help your care team assess the risk of early infection, the impact of maternal conditions such as fever or inflammation around the time of delivery, and the baby’s overall adjustment after birth.
Your clinician may order this test when there are concerns about early-onset infection, prolonged rupture of membranes, maternal illness, or if your baby shows signs such as breathing difficulty, temperature instability, or unusual sleepiness. It can also provide a baseline for monitoring over the first day of life or before starting treatments.
Results are interpreted alongside your baby’s gestational age, the rest of the complete blood count, and the overall clinical picture. Newborn reference intervals differ from those used for older children and adults, and values can shift during the early hours after delivery as the immune system adapts.
A higher monocyte count can be seen with inflammation, some infections, or physiologic stress. A lower count can occur with bone marrow suppression, some viral infections, or severe bacterial illness. Your clinician will integrate this result with examination findings and other tests to decide whether observation, additional testing, or treatment is needed.
Depending on the situation, follow-up may include repeating the blood count after a short interval, reviewing a blood smear, ordering infection studies, or simple watchful waiting. Ask your care team how this result fits into the overall plan for your baby.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Monocyte counts vary in the immediate newborn period; the exact timing of collection and whether delayed cord clamping was used can influence results due to blood volume shifts and physiologic transitions.
Fever, infections, hypertension, diabetes, or steroid treatment during pregnancy can affect the newborn white blood cell profile, including monocytes, at the time of delivery.
Cord blood can be diluted or contaminated if the cord segment is not properly prepared, and clots or delays in mixing and processing can alter automated differential counts.
Antenatal corticosteroids, intrapartum antibiotics, magnesium sulfate, and some neonatal therapies can shift white blood cell distributions and affect monocyte counts.
Preterm infants and babies who experience a difficult delivery may have different baseline blood counts and transient changes that influence interpretation.
Congenital or early-onset infections and inflammatory conditions around delivery can raise monocyte counts, while severe overwhelming infection may sometimes suppress them.
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