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• A to Z: Hypoplastic Left Heart Syndrome

  Learn about hypoplastic left heart syndrome, a rare and serious defect of the heart.

• A to Z: Hyposmolality

  Learn about metabolic conditions and conditions that can affect fluid and electrolyte levels in the blood.

• A to Z: Hypospadias

  Hypospadias is a birth defect in which the tube that carries urine out of the body, called the urethra, opens on the underside of the penis.

• A to Z: Hypothermia

  Hypothermia is a medical emergency resulting from dangerously low body temperature.

• A to Z: Hypothyroidism

  Hypothyroidism is when the thyroid gland doesn’t send enough thyroid hormone into the blood.

• A to Z: Hypoxemia

  Hypoxemia is a condition in which there is a lower than normal level of oxygen in the blood.