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Hyperviscosity of the newborn is the slowing and blockage of blood flow that results when there are too many red blood cells in an infant's blood.
Hyperviscosity can occur when the percentage of red blood cells (RBCs) in the infant's blood,, called the "hematocrit," is greater than 65%. This may result from various conditions that develop before birth, such as:
The extra RBCs can block the flow of blood in the smallest blood vessels. This may lead to tissue death from lack of oxygen. This blocked blood flow can affect all organs, including the kidneys, lungs, and brain.
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