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TSH: exam evaluates thyroid disorders

TSH: exam evaluates thyroid disorders

TSH, an acronym for thyroid-stimulating hormone, is a hormone produced in the pituitary gland. Its function is to induce the thyroid to produce two hormones: triidotironine (T3) and thyroxine (T4). T3 and T4 help control body metabolism.

Thus, when the body is producing T3 and T4 in low amounts, the brain understands that it is necessary to increase TSH secretion so that it stimulates the thyroid to

A blood test to evaluate TSH is used to check for thyroid problems, and can be done in conjunction with the T3 and T4 tests.

The TSH test can be made to evaluate:

Common symptoms of hypothyroidism, such as tiredness, dry skin, constipation, constant cold sensation or frequent menstrual periods

  • Common symptoms of hyperthyroidism such as unintentional weight loss, nervousness, diarrhea, constant feeling of heat or irregular menstrual periods
  • Possible causes of hypothyroidism or hyperthyroidism
  • If treatment for thyroid disorders is working
  • Congenital changes in thyroid oide of newborns.
  • Contraindications

There are no express contraindications to the dosage of hormones a complete blood count. However, the doctor or doctor can tell you whether you are fit to take the test or not. There are some clinical complaints that indicate the need for dosing and some protocols for screening.

Preparation for the exam

There is no special care to take the TSH test. Ask your doctor what medications you should stop to take the test - do not stop any medication without talking to your doctor first.

How it is done

In a hospital or laboratory, the TSH test is performed by a health professional as follows:

  • With the patient seated, a rubber band is tied around his or her arm to stop the flow of blood. This causes the veins to become wider, helping the practitioner hit one of them.
  • The professional cleans the arm area to be penetrated by the needle.
  • The needle is inserted into the vein. This procedure can be done more than once until the health care provider hits the vein and is able to remove the blood.
  • Blood collected in the syringe and placed in a tube
  • The elastic is removed and a gauze is placed on the where the health professional inserted the needle, to prevent any bleeding. He or she can put pressure on the bandage to staunch blood
  • A bandage is placed on the spot.

Examination time

A TSH test takes a few minutes to complete and may take longer in cases

Post-examination recommendations

There are no special recommendations after the examination. The patient can do his / her activities normally. If the blood sample is used for other tests that require fasting, the patient may feed after collection.

Frequency of the test

There is no periodicity for a TSH test. All of this will depend on the doctor's guidelines and the presence or absence of diseases that must be accompanied by the test.

Pregnant Can you do it?

There are no contraindications for the TSH test during pregnancy. However, TSH levels are expected to be below normal in the first trimester of pregnancy. All pregnant women should have a prenatal TSH assessment.

Risks

The risks involved in performing the TSH test are extremely rare. At most, there may be a hematoma at the site where blood was withdrawn. In some cases, the vein may become swollen after the blood sample is collected (phlebitis), but this can be reversed by making a compress several times a day.People who use anticoagulant medications or have coagulation problems may suffer from continuous bleeding after collection. In these cases, it is important to inform the health professional of the problem prior to collection.

Results

The test results are usually available within one business day. The interpretation of the amylase test depends on the reason it was required. Therefore, it is important to talk to your doctor for any questions.

Normal results

TSH levels are measured in milliunits (mU) per liter of blood (L). Check the reference values ​​for TSH in the blood:

Reference values ​​for the TSH test

Adults
0.4 to 4.5 mU / LChildren
0, 7 to 6.4 mU / LNewborns (1-4 days)
1 to 39 mU / LThe values ​​listed here are just a guide, not necessarily the indication that there is a disease. These ranges may vary from laboratory to laboratory. In addition, the doctor will evaluate the results based on your health and other factors.

Abnormal results

High levels of TSH may indicate:

Hypothyroidism, which is commonly caused by Hashimoto's thyroiditis

  • That treatment for Hypothyroidism is not being done correctly, with a lower dose of hormone
  • Low levels of TSH may indicate:

Tumor in the pituitary gland that is preventing the production of TSH

  • Hyperthyroidism, commonly caused by Graves' disease
  • Hypophysis is producing more TSH than necessary
  • That hypothyroidism treatment is not being done correctly with higher dose of hormone
  • First trimester pregnancy.
  • What might affect the test result?

Factors that can interfering with the TSH test results are:

Use of certain medications. For more information, talk to your doctor or nurse

  • Have an X-ray or other tests that involve radiation days before the test
  • Suffer from severe and chronic stress.

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