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HelpTest Code RT3 T3 (Triiodothyronine), Reverse, Serum
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Reporting Name
T3 (Triiodothyronine), Reverse, SSpecimen Type
SerumSpecimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 0.8 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross icterus | OK |
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 28 days | |
| Ambient | 28 days | ||
| Frozen | 28 days |
Specimen Minimum Volume
0.4 mL
Day(s) Performed
Monday through Friday
Specimen Retention Time
14 daysReport Available
2 to 6 daysReference Values
10-24 ng/dL
Useful For
Aiding in the diagnosis of the sick euthyroid syndrome
CPT Code Information
84482
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| RT3 | T3 (Triiodothyronine), Reverse, S | 3052-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 9405 | T3(Triiodothyronine),Reverse,S | 3052-8 |
Forms
If not ordering electronically, complete, print, and send a General Request (T239) with the specimen.