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22926 Thyroxine, Total

Thyroxine, Total
Test Code: T-4
Synonyms/Keywords
T4 - Thyroxine, Total​
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Serum​Serum Separator Tube (SST)​Red Top Tube (RTT)​1.0 mL​0.5 mL​0.4 mL​
Specimen Stability Information
Specimen Type Temperature Time
Serum​ Refrigerated​ <48 Hours​
Frozen​ > 48 hours​
Rejection Criteria
​Grossly hemolyzed
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday​ Less than 2 hours​
 Competitive Immunoassay using Direct Chemiluminescent Technology/Siemens Centaur
Test Information
Medicare patients must sign a waiver before specimen is collected since Medicare considers this a non-covered test.​
Reference Range Information
Performing Location Reference Range
Marshfield​
<1 month:  No reference range established
1-23 mos:  6.0-13.2 ug/dL​
2-12 yrs:  5.5-12.1 ug/dL​
13-20 yrs:  5.5-11.1 ug/dL​
>20 yrs:  4.5-10.9 ug/dL​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
84436  ​ ​ ​ ​ ​
Synonyms/Keywords
T4 - Thyroxine, Total​
Ordering Applications
Ordering Application Description
​Centricity ​T4-Thyroxine
​Cerner ​Thyroxine
​COM ​T4 - Thyroxine, Total
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Serum​Serum Separator Tube (SST)​Red Top Tube (RTT)​1.0 mL​0.5 mL​0.4 mL​
Specimen Stability Information
Specimen Type Temperature Time
Serum​ Refrigerated​ <48 Hours​
Frozen​ > 48 hours​
Rejection Criteria
​Grossly hemolyzed
Reference Range Information
Performing Location Reference Range
Marshfield​
<1 month:  No reference range established
1-23 mos:  6.0-13.2 ug/dL​
2-12 yrs:  5.5-12.1 ug/dL​
13-20 yrs:  5.5-11.1 ug/dL​
>20 yrs:  4.5-10.9 ug/dL​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday​ Less than 2 hours​
 Competitive Immunoassay using Direct Chemiluminescent Technology/Siemens Centaur
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
84436  ​ ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.