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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
An 18-month-old toddler is brought to a pediatric hematologist by his father. The boy was referred to this office for prolonged neutropenia. He has had several blood tests with an isolated low neutrophil count while hemoglobin, hematocrit, and platelet count is normal. The boy was born at 39 weeks gestation via spontaneous vaginal delivery. He is up to date on all vaccines and is meeting all developmental milestones. Today his complete blood count (CBC) with differential shows:
Hemoglobin: 15.5 g/dL
Platelets: 300,000 mm3
Neutrophils: 20%
Bands: 2%
Lymphocytes: 40%
Monocytes: 15%
Today, he has a heart rate of 90/min, respiratory rate of 22/min, blood pressure of 110/65 mm Hg, and temperature of 37.0°C (98.6°F). On physical exam, the child appears healthy and is within expected growth parameters for his age and sex. A bone marrow biopsy shows normal bone marrow with 95% cellularity and trilineage maturation. Flow cytometry is normal with no abnormal markers noted. Which of the following is the most probable diagnosis in the present case?
assistant
Chronic benign neutropenia