How common are inborn errors of metabolism among live births?

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metabolic disease Enzyme defects in urea cycle disorders.

The estimated incidence of inborn errors of metabolism is approximately 1 in every 4,000 live births.1

While these individual disorders are considered rare, they are genetically determined and result from the absence or reduced activity of a functional enzyme in a specific metabolic pathway. Because these conditions are hereditary, their prevalence can vary significantly depending on factors such as ethnic background and the specific population being studied. Early detection through newborn screening is critical for many of these conditions, as timely intervention—such as specialized diet therapy—can often prevent severe developmental delays or permanent brain damage.123