THYROID FUNCTION TESTS

THYROID FUNCTION TESTS

These are laboratory tests that are performed to determine thyroid function.

PRECAUTIONS IN SPECIMEN COLLECTION & HANDLING

•RED TOP OR YELLOW TOP CAN BE USED
•AVOID USE OF LIPEMIC & HEMOLYZED SERUM
•NEWBORNS- FILTER PAPER BLOT CAN BE USED
•FASTING- NOT NEEDED
•SAMPLES CAN BE REFRIGERATED-24 HRS.
•FROZEN FOR 30 DAYS (AVOID REPEATED THAWING)

BLOOD TESTS:

•Thyroid-Stimulating Hormone (TSH)
This is a significant marker for hypothyroidism. an increase in its concentration indicates hypothyroidism and a decrease indicates hyperthyroidism
Thyroxine (T4) and Triiodothyronine (T3)
increased concentrations indicate hyperthyroidism
decreased concentrations indicate hypothroidism
•Thyroxine-Binding Globulin. (TBG)
this is the major binding protein of thyroid hormones
Other tests:
rT3, T3U, FTI, FT3, FT4

Stimulation Tests

•-TRH STIMULATION TEST
TRH IS INJECTED INTO THE PATIENT AND THE RESPONSE OF THE PITUITARY GLAND IS OBSERVED.
•TSH STIMULATION TEST

TSH IS GIVEN TO THE PATIENT AND THEN THE REPONSE OF THE THYROID GLAND IS MEASURED.

THE CATECHOLAMINES

ADRENAL HORMONES
The CATECHOLAMINES are produced and metabolized in the ADRENAL MEDULLA.

The two most common catecholamines are:
1. EPINEPHRINE
2. NOREPINEPHRINE

These catecholamines are also called "EMERGENCY HORMONES" as they increase the ability of the body to respond to stressful situations.

They elevate blood pressure, increase glucose concentration in the blood stream and control a series of biochemical processes.

For more information about the topic visit the link below:

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