Thyroid Stimulating Hormone

Message

Performed in Chemistry

Test Code

TSH

Alias/See Also

TSH, High Sensitivity

CPT Codes
83519

Preferred Specimen

Green Top LiHep, Plasma
WyMCC and BLMC - SST

Other Acceptable Specimens

Lavender Top EDTA, Gold/SST or Red Top

Specimen Stability

Refrigerated 7 days
Frozen 1 month

FDA Status
FDA Approved

Setup Schedule

Daily, Sunday through Saturday

Report Available

Less than 4 hours

Reference Range

Age	Male/Female
0-4 days	3.20-35.00
4 days-1 month	1.70-9.10
1 month-1 yr	0.80-8.20
1-6 yrs	0.60-7.40
6-11 yrs	0.50-5.40
11-20 yrs	0.30-4.00
20-150 yrs	0.45-4.50

Clinical Significance

TSH secretion by the anterior pituitary is controlled by thyrotropin releasing hormone, a tripeptide produced by the
hypothalamus. TSH stimulates the production of thyroxine (T4) and triiodothyronine (T3) by the thyroid gland. The
circulating free fractions of T4 and T3 in turn regulate the secretion of TSH by a negative feedback mechanism at the
pituitary and possibly the hypothalamus. The diagnosis of overt hypothyroidism by the finding of a low total T4 or free T4
concentration is readily confirmed by a raised TSH concentration.
Measurement of low or undetectable TSH concentrations may assist the diagnosis of hyperthyroidism, where
concentrations of T4 and T3 are elevated and TSH secretion is suppressed.

Performing Laboratory
On-site

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.