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Thyroid Stimulating Hormone
Test CodeTSH
Alias/See Also
TSH
CPT Codes
84443
Preferred Specimen
Light GREEN (PST):
Other Acceptable Specimens
Litium Heparin plasma
Serum (Red) or Gold (SST) or Orange (OJ) or Tiger Top Serum
Serum (Red) or Gold (SST) or Orange (OJ) or Tiger Top Serum
Instructions
No hemolysis.
Specimen Stability
Samples are stable up to 18 hours at room temperature in tightly capped tubes.
Samples are stable up to 7 days at 2-8 degrees C.
Samples are stable tup to 90 days at -20 degrees C.
Samples are stable up to 7 days at 2-8 degrees C.
Samples are stable tup to 90 days at -20 degrees C.
Setup Schedule
24x7
Reference Range
CRMC and CCMC:
- < 2 Months: 1.120-6.310 uIU/mL
- 2 Months-6 Months: 0.730-5.700 uIU/mL
- 6 Months-14 Years: 0.700-5.600 uIU/mL
- 14-18 Years: 0.470-5.500 uIU/mL
- > 18 Years: 0.450-5.330 uIU/mL
- >18 Years: 0.400-4.000 IU/mL
Clinical Significance
The thyroid-stimulating hormone (TSH) test is often the test of choice for evaluating thyroid function and/or symptoms of a thyroid disorder, including hyperthyroidism or hypothyroidism.
TSH is produced by the pituitary gland, a tiny organ located below the brain and behind the sinus cavities. It is part of the body's feedback system to maintain stable amounts of the thyroid hormones thyroxine (T4) and triiodothyronine (T3) in the blood and to help control the rate at which the body uses energy.
A TSH test is frequently ordered along with or preceding a free T4 test. Other thyroid tests may include free T3 and thyroid antibodies.
TSH testing is used to:
TSH is produced by the pituitary gland, a tiny organ located below the brain and behind the sinus cavities. It is part of the body's feedback system to maintain stable amounts of the thyroid hormones thyroxine (T4) and triiodothyronine (T3) in the blood and to help control the rate at which the body uses energy.
A TSH test is frequently ordered along with or preceding a free T4 test. Other thyroid tests may include free T3 and thyroid antibodies.
TSH testing is used to:
- Diagnose a thyroid disorder in a person with symptoms
- Screen newborns for an underactive thyroid
- Monitor thyroid replacement therapy in people with hypothyroidism
- Monitor anti-thyroid treatment in people with hyperthyroidism
- Help diagnose and monitor infertility problems in women
- Help evaluate the function of the pituitary gland (occasionally)
- Screen adults for thyroid disorders, although expert opinions vary on who can benefit from screening and at what age to begin
Performing Laboratory
CRMC Laboratory
CCMC Laboratory
FHSH Laboratory
