Thyroid stimulating hormoneThe thyroid stimulating hormone i.e. TSH is a hormone that is released by the pituitary gland that is responsible secretion of thyroxine by the thyroid gland. Assessment of TSH can be done through a simple blood test analysis.

Performing a TSH analysis

Assessing the thyroid stimulating hormone levels in the blood is very simple. Firstly, it is important that any medication that may affect the levels of TSH in the blood stream be stopped. Examples include lithium, prednisolone and amiodarone.

However, it may not always be possible to stop these drugs especially if they are essential in the treatment of the patient.

A small needle is inserted into the vein and the required quantity of blood is removed for analysis. This is then sent to a clinical pathology laboratory where the sample is analysed.

Interpreting the results

A low TSH value in those individuals who are not taking any form of medication may indicate an overactive thyroid i.e hyperthyroidism. Additional tests may be required in order to confirm this. However, if the levels of TSH at high, it is possible that the thyroid is underactive and the patient is suffering from hypothyroidism.

Normal levels of TSH range between 0.4 – 4 mIU/L. The levels determined through clinical laboratory analysis may vary depending upon the use of certain medication and the presence of infections.

For this very reason, it is important for the treating physician to obtain a clear-cut history from the patient regarding the use of drugs and the presence of a fever or any underlying co-morbidities.

Conclusion

In conclusion, performing a thyroid stimulating hormone level is a useful test to determine the function of the thyroid gland.