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HelpTest Code LAB4099 THYROID STIMULATING HORMONE, REFLEX FREE T4
Additional Codes
Internal / External: TSHRFLX
Beaker: LAB4099
PERFORMED AT
SBH LABORATORY
SRH LABORATORY
SMH LABORATORY
SPH LABORATORY
HDH LABORATORY
Specimen Requirements
Container Type: Lithium Heparin (Green Top) or Serum Separator (Gold Top)
Specimen Type: Plasma or Serum
Preferred Volume: 1 mL
Emergency Minimum Volume: 0.3 mL
Specimen Processing: Separate serum or plasma from cells as soon as possible by centrifugation. Store and transport refrigerated. One freeze/thaw acceptable.
Alternate Specimens: Plain Serum Tube (Red Top)
Stability:
| Temperature | Time |
|---|---|
| Room Temp | Unacceptable |
| Refrigerated | 1 week |
| Frozen (-20 øC) | 1 month |
Method
CLIA
Synonyms
TSH Third Generation, THYROID STIMULATING HORMONE 3RD GENERATION, TSH Reflex
CPT Codes
84443
Department
Chemistry
Test Schedule
Daily
Test Includes
TSH (Thyroid Stimulating Hormone), uIU/mL; FT4 (Free T4), ng/dL (Reflex test)
Additional Test Information
If TSH value is above or below the normal reference range for a patient, it will reflex FreeT4. Additional charges will apply. See normal reference ranges below.
| Patient Age | Normal Reference Range |
|---|---|
| 0 to 6 days | 0.70 - 15.20 uIU/mL |
| 6 days to 3 months | 0.70 - 11.00 uIU/mL |
| 3 months to 1 year | 0.70 - 8.40 uIU/mL |
| 1 year to 6 years | 0.70 - 6.00 uIU/mL |
| 6 years to 11 years | 0.60 - 4.80 uIU/mL |
| 11 years to 20 years | 0.50 - 4.30 uIU/mL |
| 20 years or older | 0.30 - 4.20 uIU/mL |