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Test Code TSHCO Thyroid-Stimulating Hormone, Highly Sensitive (hs-TSH)

Additional Codes

EPIC:  LAB129

Methodology

Chemiluminescent Immunoassay

Functional sensitivity: 0.01 mIU/mL


Used in the differential diagnosis of primary (thyroid) from secondary (pituitary) and tertiary (hypothalamus) hypothyroidism, in the diagnosis of primary hyperthyroidism, and in monitoring patients on thyroid replacement therapy.

Performing Laboratory

St. Joseph Hospital

Specimen Requirements

Preferred:  Plasma

Draw blood in a light green-top (lithium heparin gel) tube. (Hemolyzed specimen is not acceptable.) Centrifuge and separate plasma from cells within 2 hours of collection, and send 1 mL of lithium heparin plasma refrigerated.

Note:  Label specimen as “plasma”.

 

Acceptable:  Serum

Draw blood in a plain, red-top tube or a serum gel tube. (Hemolyzed specimen is not acceptable.) Centrifuge and separate serum from cells within 2 hours of collection and send 1 mL of serum refrigerated.

Note:  Label specimen as “serum”

Reference Values

0.270 - 4.700 µIU/mL

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

84443