Reverse T3
Test Mnemonic
T3REV
CPT Codes
- 84482 - QTY (1)
LOINC ®
3052-8
Aliases
- Triiodothyronine, Reverse
Performing Laboratory
ARUP
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 2 mL | Serum | SST (Gold) | Frozen | Separate serum from cells within 2 hours of collection. |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 2 mL | Serum | No additive (Red) | Frozen | Separate serum from cells within 2 hours of collection. | |
| 2 mL | Plasma | EDTA (Lavender) | Frozen | Separate plasma from cells within 2 hours of collection. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 1 day |
| Refrigerated | 1 week |
| Frozen | 3 months |
Days Performed
Sun - Sat
Turnaround Time
2 - 6 days
Methodology
| Name | Description |
|---|---|
| Quantitative Liquid Chromatography - Tandem Mass Spectrometry |
Reference Range
| Reverse T3 | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| 18 Years | 99 Years | Normal | 9.0 - 27.0 | ng/dL | Years | 17 Years | Normal | Not established | ng/dL |
Special Info
Grossly hemolyzed specimens are not acceptable. Allow serum specimen to clot completely at room temperature before centrifuging. This test is New York DOH approved.
Clinical Info
Generally not recommended for routine evaluation of thyroid disorders, although may be considered in pregnant women.