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HelpTest Code RT3 T3 (Triiodothyronine), Reverse, Serum
Test Down Notes
This test is temporarily unavailable due to concerns around acceptable turnaround times. Order FRT3S as an alternative.
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 |
|---|---|---|
| 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 1 of the following forms with the specimen:
-General Request (T239)
-Renal Diagnostics Test Request (T830)