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Test Code LAB126 Total T4

Performing Laboratory

Asante Rogue Regional Medical Center

Specimen Minimum Volume

0.5 mL

Billing Code

2070597

Methodology

Competitive Binding Immunoenzymatic Assay

Specimen Requirements

Serum only

Day(s) Test Set Up

Run Daily

Test Classification and CPT Coding

84436
 

Additional Information

Use:The clinical importance of total T4 determination is in the
diagnosis and confirmation of thyroid disorders.  Elevated
levels of T4 occur in Graves’ disease, subacute thyroiditis,
toxic nodule, or secondary (pituitary) hyperthyroidism. 
Decreased levels occur in primary hypothyroid diseases such as
Hashimoto’s thyroiditis and neonatal hypothyroidism or
secondary hypothyroidism due to defects at the
hypothalamic-pituitary level.

Specimen Transport Temperature and Stability

Centrifuge collection tube and refrigerate within 2 hours of collection.  Spun SST stable 24 hours at 2° to 8° C.  Serum stable 48 hours if aliquoted and refrigerated at 2° to 8° C.

If the assay will not be completed within 24 hours, or for shipment of samples, freeze at -20°C or colder. Thaw samples only once.

Performing Department

Chemistry

Reasons for Rejection

Quantity not sufficient (QNS)

Lacking Two Patient Identifiers:

         1-Patient's First & Last name 

         2-Patient's Date of Birth