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Test Code SQ T4, EPIC LAB126 T4 (Thyroxine), Total, Plasma

Important Note

NEW INTERFERENCE CLAIM:

Patients receiving therapy with high biotin doses (i.e. > 5 mg/day), could cause a +/- 10% change in their test results. It is recommended by Roche that samples should not be drawn until at least 8 hours following the last biotin administration.

Methodology

Electrochemiluminescence

Performing Laboratory

Meriter Laboratories

Specimen Requirements

Specimen Type: Plasma

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

Specimen Volume: 1 mL

Collection Instructions: Avoid hemolysis and lipemia.

Specimen Transport Temperature

Refrigerated/Frozen OK

Reference Values

<3 days: 7.0-18.0 ug/dL

3-30 days: 8.0-17.0 ug/dL

1-11 months: 6.2-15.5 ug/dL

1-4 years: 6.0-14.0 ug/dL

5-9 years: 5.5-13.5 ug/dL

≥10 years: 4.6-12.0 ug/dL

 

Day(s) Test Set Up

Monday through Sunday

Analytical Time

Stat:

1 hour

Routine:

4 hours

Test Classification and CPT Coding

84436

Specimen Requirements Additional Information

Specimen Stability:Plasma is stable refrigerated (2° C-8° C) for 7 days or frozen (≤-20° C) for 30 days. Freeze only once.

 

Reporting Title

T4 Total (Thyroxine)