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H

Term Definition
Hepatic

Pertaining to the liver.

Hepatocytes

Liver cells.

Heterozygote

An individual who has carries a gene with a particular characteristic (like OTC deficiency).

HiB vaccine

An immunization which prevents childhood Haemophilus influenzae B infections, which can cause severe and potentially deady illnesses that affect the brain, lungs, and bones or joints. It is administered as a series of four doses to children older than 6 weeks but younger than 5 years of age.

Hyperammonemia

Abnormally high levels of ammonia in the blood; if untreated, causing severe agitation, vomiting, lethargy, coma and death.

Hypernatremia

Abnormally high levels of sodium in the blood.

Hyperthyroid

Overproduction of the thyroid hormone by the thyroid gland.

Hyperthyroidism

A disorder that occurs when the thyroid gland produces too much thyroid hormone, causing nervousness, fatigue, difficulty sleeping, heat intolerance, rapid and irregular heartbeat, frequent bowel movements, weight loss, mood swings, and possibly a goiter (an enlarged thyroid that may cause the neck to look swollen).

Hypertonia

A condition marked by an abnormal increase in muscle tension and a reduced ability of a muscle to stretch, caused by disease, or conditions such as dystonia (prolonged muscle contractions that cause twisting and repetitive movements or abnormal posture), rigidity, or a combination of factors. Severe cases can also make joint movement impossible.

Hypoglycemia, unrelated to diabetes: A condition, also known as low blood sugar, in which blood glucose drops below normal levels in someone who does not have diabetes. The first type is known as reactive hypoglycemia in which symptoms occur within 4 hou
Hyporeflexia

A condition characterized by below normal or absent reflexes and generally associated with a lower motor neuron deficit.

Hypothermia

Abnormally low body temperature below 95 degrees F, causing heart and respiration slowing and paleness.

Hypothyroid

Insufficient production of the thyroid hormone by the thyroid gland.

Hypothyroidism

A disorder that occurs when the thyroid gland does not produce enough thyroid hormone, causing sensitivity to cold temperatures, depression, fatigue, constipation, joint or muscle pain, unintentional weight gain, and eventual slow speech, hoarseness, and decrease in taste and smell.

Hypotonia (low tone)

A condition in which there is diminution or loss of muscular tonicity, resulting in stretching of the muscles beyond their normal limits. Decreased muscle tone that may be a sign of a problem the brain, spinal cord, nerves, or muscles. Infants with hypotonia seem floppy and feel like a "rag doll" when held.

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