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Term Definition
Hashimoto’s disease

(HD) a disorder affecting the thyroid gland (a small gland below the Adams’ apple). In this disease the immune system attacks the thyroid gland, often leading to an underactive thyroid: “hypothyroidism.” HD is also known as “chronic lymphocytic thyroiditis.”

HBV vaccine

helps prevent hepatitis B virus (HBV) infection, an infection of the liver that can lead to liver cancer and death. The vaccine is given as a series of 3 or 4 shots. The HBV vaccine and Hib vaccine can also be given together in the same shot.

Head Ultrsound

A photograph (sonogram) of the head produced by sound waves.

Head X-ray

A photograph of the skull produced through radiation

Heart murmur

An abnormal sound during the heartbeat cycle, which may be harmless, or may require tests to be sure the murmur is not the result of an underlying condition

Heart valve problems

A condition in which one or more of your heart valves don't work properly. The heart has four valves: the tricuspid (tri-CUSS-pid), pulmonary (PULL-mun-ary), mitral (MI-trul), and aortic (ay-OR-tik) valves.


A surgical procedure where one cerebral hemisphere ( half of the brain) is removed or disabled in order to treat extreme cases of brain seizures

Hib vaccine

Helps prevent Haemophilus influenza type b, a leading cause of serious illness in children. It can lead to meningitis, pneumonia and a severe throat infection that can cause choking. The Hib vaccine is given as a series of 3 or 4 shots.

High Arched Palate

roof of the mouth is peaked instead of rounded

High-resolution chromosome analysis

An examination of a chromosome via a high-resolution microscope; this test can sometime detect PMS, but additional, more detailed tests are recommended for confirmation.

Hip dysplasia – congenital

The abnormal formation of the hip joint in which the ball at the top of the thighbone (the femoral head) is not stable within the socket (the acetabulum). The ligaments of the hip joint may also be loose and stretched.

Hip dysplasia – developmental

(DDH) is a dislocation of the hip joint that is present at birth. The condition is found in babies or young children.

History of encephalitis

Prior instance(s) of inflammation ( e.g. swelling) of the brain

History of meningitis

Meningitis is inflammation of the meninges, the membranes protecting the brain or spinal cord. This is usually caused by a bacterial infection, and the symptoms include headache, stiff neck, fever and nausea. In recent years, major efforts have been made to curb the spread and deadliness of meningitis. For example, in 1944, penicillin was demonstrated to be effective, and there have been several vaccines developed for combating this disease.

Hole in the heart

A congenital heart defect where there is a small hole between heart chambers. Some close up on their own, while others require surgery to correct. There are several differnt types. One called patent ductus arteriousus is an opening between the pulmonary artery and the aorta that does not close after birth and results in the child's blood not circulating sufficient oxygen throughout the body.

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