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  • Title: Polycythemia in the newborn.
    Author: Upadhyay A, Aggarwal R, Deorari AK, Paul VK.
    Journal: Indian J Pediatr; 2002 Jan; 69(1):79-82. PubMed ID: 11876126.
    Abstract:
    Polycythemia is defined as a venous hematocrit above 65%. The relationship between viscosity and hematocrit is almost linear till 65% and exponential thereafter. Increased viscosity of blood is associated with symptoms of hypo-perfusion. The hematocrit in a newborn peaks at 2 hours of age and decreases gradually after that. The etiology of polycythemia is related either to intra-uterine hypoxia or secondary to fetal transfusion. Clinical features related to hyperviscosity may affect all organ systems and this entity should be screened for in high-risk infants. Polycythemia maybe symptomatic or asymptomatic and guidelines for management of both types are provided in the protocol.
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