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TSH Thyroid Stimulating Hormone

 
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Description
 

CPT Code(s)

84443

Methodology

Immunoassay (IA)

Reference Range(s)

Premature Infants (28-36 Weeks)
1st Week of Life0.20-27.90 mIU/L
Term Infants (>37 Weeks)
Serum or Cord Blood1.00-39.00 mIU/L
1-2 Days3.20-34.60 mIU/L
3-4 Days0.70-15.40 mIU/L
5 Days-4 Weeks1.70-9.10 mIU/L
1-11 Months0.80-8.20 mIU/L
1-19 Years0.50-4.30 mIU/L
≥20 Years0.40-4.50 mIU/L
Pregnancy
First Trimester0.26-2.66 mIU/L
Second Trimester0.55-2.73 mIU/L
Third Trimester0.43-2.91 mIU/L
TSH levels decline rapidly during the first week of life in most children, but may remain transiently elevated in a few individuals despite normal free T4 levels. For proper interpretation of an abnormal TSH from a newborn thyroid screen, a Free T4 by Dialysis (test code 35167) or Total T4 (test code 867) should be considered.

Clinical Significance

For differential diagnosis of primary, secondary, and tertiary hypothyroidism. Also useful in screening for hyperthyroidism. This assay allows adjustment of exogenous thyroxine dosage in hypothyroid patients and in patients on suppressive thyroxine therapy for thyroid neoplasia.

Test FAQ

TSH

Alternative Name(s)

Thyrotropin,Thyroid Stimulating Hormone


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