TSH testing is a laboratory analysis that measures a chemical substance produced by the anterior pituitary gland called Thyroid Stimulating Hormone. TSH regulates the production of hormones by the thyroid gland. An abnormal level of TSH in the blood indicates the likelihood that the thyroid is not functioning normally, making TSH testing an effective aid in the detection of thyroid irregularities.

The thyroid gland is located just below the "Adam's apple". It produces hormones, including T3 & T4, that affect and regulate virtually every bodily activity. Thyroid hormones control metabolism and organ function and can directly affect weight loss or gain, energy levels, skin condition, memory, heart rate, cholesterol levels, menstruation, bowel movement, and many other functions. Even a person's feeling of well-being.

If the thyroid gland is not working properly, a variety of symptoms and possibly severe medical problems can result. The good news is that if discovered and properly treated, most thyroid disorders can be controlled and the patient can lead a healthy, normal and active life.

Hypothyroidism is the condition caused when the thyroid produces less thyroid hormones than the body needs. It is the most common thyroid irregularity and is indicated by a high level of TSH is the blood. The level of TSH is high because the pituitary gland senses the under-production of T4 by the thyroid and increases the production of Thyroid Stimulating Hormone in an attempt to increase T4 production.

Some of the symptoms of hypothyroidism include the following:

• Weight gain
• Cold intolerance
• Fatigue
  
• Muscle cramps
  
• Dry skin, dry hair, and/or hair loss
  
• Edema
  
• Constipation
  
• Menstrual irregularity (especially heavy periods)
  
• Depression
  
• Forgetfulness

Hyperthyroidism is the condition caused when the thyroid produces more hormone (T4) than the body needs. It is much less common than hypothyroidism and is indicated by a low level of TSH is your blood. The level of TSH is low because the pituitary gland senses the over-production of T4 by the thyroid and decreases the production of Thyroid Stimulating Hormone in an attempt to reduce T4 production.

Some of the symptoms of hyperthyroidism include:

• Weight loss
• Heat intolerance
  
• Fatigue
  
• Muscle weakness
  
• Tremor
  
• Heart palpitations
  
• Frequent bowel movements
  
• Menstrual irregularity (especially light periods)
  
• Nervousness, irritability, insomnia
  
• Others

If your screening indicates an abnormal level of TSH your doctor will likely have you test the level of T3 & T4 in your blood. These are tests that we now offer. In rare cases, the level of TSH will be low but the level of T4 will be normal. This may be an indication that your thyroid is functioning properly, but the pituitary glad itself is suffering from an anomaly. This condition is known as secondary hypothyroidism.

FAQ: Simply scroll down the page to read the answers, or you may click on a question and you will be taken directly to the answer.

• How long does the test take?
• Should I fast before taking the test?
• What test result values are desirable?
  
• How are the test results presented?

How long does the test take?
Drawing the blood sample takes about 3 – 5 minutes. The sample is taken from the arm using traditional venipuncture techniques. A local traditional hospital runs the test and the results are usually mailed within 1 – 3 weeks.

Should I fast before taking the test?
No, it is not necessary to fast before taking the PSA test. Ejaculation can cause a temporary increase in blood PSA levels, therefore, some doctors suggest that men abstain from sexual activity for two days prior to testing.

Note: If you are having other tests performed, please see their respective test descriptions.

What test result values are desirable?
Results between 0.5 and 5.0 uIU/ml (international units per milliliter) are considered normal. Results above 5.0 uIU/ml are an indication of possible hypothyroidism, and results below 0.5 uIU/ml are an indication of possible hyperthyroidism.

Because it is also possible to have results which fall within the normal range but still suffer from a thyroid irregularity, it is important to report any possible symptoms of either hypothyroidism or hyperthyroidism to your doctor.

How are the test results presented?
A certified laboratory analyzes the blood sample to see how much PSA is present and then reports the results. The results show your results and also the normal range for someone of your gender and age range.