Total T4

Test Code: TD_CH179

CPT Code(s): 84436

$10

Test Details

Alternative Name(s)

Thyroxine (T4) total

Test Includes

T4 Total

Methodology

Abbott Alinity chemiluminescent microparticle immunoassay (CMIA)

Rejection Criteria

Reference Range(s)

4.5-10.5 ug/dL

Specimen Requirements

Preferred Specimen

Serum Separator Tube

Minimum Volume

0.5 mL serum

Sample Stability

4 days room temperature
8 days refrigerated 1 year frozen

Transport Temperature

Refrigerated

Collection Instructions

Allow sample to clot in an upright position for
at least 30 minutes, then centrifuge sample. Refrigerate.

Alternative Specimen

0.5 mL serum from a plain red top tube. Allow specimen to clot completely for 20 to 30 minutes prior to centrifugation. Centrifuge at 1,600 RCF for 10 minutes. Using a transfer pipette remove the serum and transfer to a transfer tube and clearly label as serum from a plain red top tube