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Mayo Clinic Laboratories

Test Code TSHCO Thyroid-Stimulating Hormone (TSH), Plasma or Serum

Additional Codes

LAB129

Methodology

Used to monitor thyroid function; diagnostic for primary hyperthyroidism or hypothyroidism.

TSH is the initial testing performed as part of a #THCAS “Thyroid Cascade Profile.” Free T4 and total T3 are reflexed as appropriate.

Performing Laboratory

St. Mary's Regional Medical Center-Chemistry

 

CPT: 84443

Specimen Requirements

Submit only 1 of the following specimens:

 

Plasma

Container/Tube: Light green-top (lithium heparin) tube

Specimen: 1 mL of lithium heparin plasma

Transport Temperature: Ambient

Collection Instructions:

Note:

1. Indicate plasma.
2. Label specimen appropriately (plasma).

 

Serum

Container/Tube: Plain, red-top tube or serum gel tube

Specimen: 1 mL of serum

Transport Temperature: Ambient

Collection Instructions:

Note:

1. Indicate serum.
2. Label specimen appropriately (serum).

Reference Values

 

01-23 months: 0.816 - 5.91 mIU/L

02-12 years: 0.662 - 3.90 mIU/L

13-20 years: 0.438-3.98 mIU/L

>20 years: 0.358-3.74 mIU/L

 

Day(s) Test Set Up

Monday through Sunday