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Learn about hypoplastic left heart syndrome, a rare and serious defect of the heart.
Learn about metabolic conditions and conditions that can affect fluid and electrolyte levels in the blood.
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.
Hypothermia is a medical emergency resulting from dangerously low body temperature.
Hypothyroidism is when the thyroid gland doesn't send enough thyroid hormone into the blood.
Hypoxemia is a condition in which there is a lower than normal level of oxygen in the blood.