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HelpEpic Code LAB126 T4 (Thyroxine), Total, Blood Level
Test Name Alias
T4 Total | 724 | SHO724 | 1230101198
Interface Order Alias
11084
Ordering Instructions
Please keep in mind, biochemical thyroid function evaluation should begin with the Thyroid Function Cascade (SH#6701)
Collection Instructions
Specimen Collection: Blood
Container(s): Gold Top (Serum Separator-SST Gel) or Light Green Top (Lithium Heparin Gel)
Minimum Volume to Collect: 1.0 mL
Neonate Volume to Collect: 0.5 mL
Capillary collect ok? Yes
Microtainer acceptable: Yes
Collection Instructions:
- After collection, gently invert tube 8-10 times.
- Specimen should be processed within 2 hours See Processing Instructions.
Processing Instructions (Laboratory, Outpatient or Off-site collection)
Processed Specimen: Serum or Plasma
Centrifuge/Spin: Yes
Aliquot: Yes
Processing Instructions:
- Serum is preferred specimen type
- Green Tube/Plasma: Centrifuge after collection.
- Gold Tube/Serum: Allow blood to clot for 30 minutes in a vertical position and centrifuge within 2 hours.
Transport Temperature: Refrigerate
Specimen Transport Temperature
Refrigerate
Specimen Stability
Ambient: 8 hours
Refrigerate: 72 hours
Frozen: aliquot plasma/serum for longer storage
Laboratory Retention: 72 hours
Test Frequency
Available daily, usual TAT 1 day.
Reference Range
4.5 to 11.7 mcg/dL
Performing Department
Chemistry
Performing Department Laboratory Location
Corewell Health Reference Laboratory, Grand Rapids, MI
Methodology
Method is Roche cobas Electrochemiluminescense Immunoassay.
Patient results determined by assays using different manufacturers for methods may not be comparable.
CPT
84436
CDM Code
3018443602
Epic Test ID
1230101198
LOINC
Total T4: 3026-2
Mayo Access Code
SHO724
Reviewed Date
3/7/2024
Orderable Regions
Southwest; West
Updated Date
12/2/2025 - Gold Top Preferred specimen