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HelpTest Code T4 THYROXINE (T4), TOTAL, SERUM
Additional Codes
| Software | Test Code |
|---|---|
| Label Text | T4 |
| EPIC | LAB126 |
Performing Laboratory
NorDx Laboratories
Useful For
Aiding in the diagnosis of hypothyroidism and hyperthyroidism; assessing thyroid function in patients with normal thyroxine-binding globulin levels; monitoring patients on hormone replacement therapy
Method Name
Electrochemiluminescent Immunoassay (ECLIA)
Reference Values
Adult:
5.3-12.3 ug/dL
Pediatric:
1-3 years: 6.8-13.5 ug/dL
3-10 years: 5.5-12.8 ug/dL
Days and Times Test Performed
Monday through Sunday
Report Available
1 Day
Specimen Type
Serum
Preferred Container
Serum Separator Tube (SST)
Preferred Volume
Serum: 1 mL (Serum Separator Tube (SST))
Minimum Volume
Serum: 0.5 mL (Serum Separator Tube (SST))
Specimen Collection and Handling
Spin specimen, separate from clot and send refrigerated.
Specimen Stability Information
Specimen Type: Serum
Frozen: 1 Month
Refrigerated: 7 Days
Must be spun/separated within: 2 Hours
Add On Capable
Yes
Advance Beneficiary Notice Requirements
This test, when ordered on Medicare patients, is subject to the National Coverage Determination (NCD) policies. Please verify that the diagnosis code (ICD code) you have chosen demonstrates medical necessity for the test as documented in the physician’s patient record. The CMS web site is available to assist you with this verification. A properly executed Advance Beneficiary Notice (ABN) must be submitted with the specimen if medical necessity is not demonstrated by the ICD code chosen.
CPT Code Information
|
CPT Code |
CPT Description |
CPT Disclaimer |
|---|---|---|
| 84436 | Thyroxine, Total, Quantitative |
Keywords
T4 (THYROXINE), TOTAL ONLY
THYROXINE
THYROXINE (T4), TOTAL OR FREE
Performing Laboratory Location
NorDx Laboratories
Clinical Significance
Synthetic T3 causes decreased total T4.
LOINC Code Information
3026-2
Acceptable Alternative Container(s)
Plasma Separator Tube (PST)
Red Top Tube