IMMULITE 2000/2000 XPi TSI Assay

IMMULITE 2000/2000 XPi TSI Assay
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Graves’ disease is an autoimmune disorder that leads to overactivity of the thyroid gland—hyperthyroidism. It is caused by an abnormal immune system response that causes the thyroid gland to produce too much thyroid hormone. The thyroid gland is a butterfly-shaped organ that lies flat against the windpipe in the throat. It produces the hormones thyroxine (T4) and triiodothyronine (T3) and plays an important role in controlling the body's metabolism.1

What are the symptoms of Graves’ disease?2

People with Graves’ disease may have common symptoms of hyperthyroidism such as:

  • Nervousness or irritability
  • Fatigue or muscle weakness
  • Heat intolerance
  • Trouble sleeping
  • Hand tremors
  • Rapid and irregular heartbeat
  • Frequent bowel movements or diarrhea
  • Weight loss
  • Goiter, which is an enlarged thyroid that may cause the neck to look swollen and can interfere with normal breathing and swallowing

In addition, the eyes of people with Graves’ disease may appear enlarged because their eyelids are retracted (appear pulled back into the eye sockets), and their eyes bulge out from the eye sockets. This condition is called Graves’ ophthalmopathy.2
Who is likely to develop Graves’ disease?
Graves’ disease usually occurs in people younger than age 40 and is seven to eight times more common in women than men.2 Women are most often affected between ages 30 and 60.3
According to the National Women's Health Information Center, Graves’ disease affects about 2% of women at some time in their lives.

Read more about women and thyroid disease

Factors such as age, sex, heredity, and emotional and environmental stress are likely involved in Graves’ disease. And a person’s chance of developing Graves’ disease increases if other family members have the disease. Researchers have not been able to find a specific gene that causes the disease to be passed from parent to child. While scientists know some people inherit an immune system that can make antibodies against healthy cells, predicting who will be affected is difficult.2

Laboratory Testing

Laboratory testing is essential to verify diagnosis, help estimate severity, monitor, and assist in planning therapy for Graves’ disease patients.

To detect thyroid dysfunction, testing may begin with:
TSH—typically low in Graves’ disease
Total or free T4—usually elevated
Total or free T3—often elevated
These tests may also be ordered periodically to monitor thyroid function and hormone production.
Laboratory tests used to help diagnose Graves’ disease and distinguish it from other autoimmune conditions may include one or more tests used to detect the presence of thyroid antibodies:1

Thyroid-stimulating immunoglobulin (TSI)—the presence of this antibody is diagnostic for Graves’ disease.
Thyroid-stimulating hormone receptor antibody (TRAb)—less specific than TSI.
Anti-thyroid peroxidase antibody (anti-TPO)—this autoantibody is found in most people with Graves’ disease, as well as in Hashimoto thyroiditis.

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