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HelpTest Code LAB126 Thyroxine (T4)
Collection:
Specimen: Blood
Preferred: Lt Green w/ Gel - Li Hep
Acceptable: SST or Red Top
Specimen Volume: 5 mL; Minimum 1.0 mL
Pediatric Collection:
One Lt Green w/ Gel - Li Hep, SST, or Red Top microtainer filled to 600 uL.
Stability:
If testing is delayed more than 24 hours, remove serum/plasma from the cells or gel separator. Once serum/plasma is separated from cells:
Ambient: 8 Hours
Refrigerated (preferred): 1 Week
Frozen: 2 Weeks
Turn Around Time (TAT):
STAT: 2 HOURS
Routine: 4 HOURS
Test Availability:
24 hours a day / 7 days a week
Reference Interval:
| Age | Female | Male |
|---|---|---|
| < 7 days | No established reference range | No established reference range |
| 7 days - < 1 year | 5.9 - 13.7 mcg/dL | 5.9 - 13.7 mcg/dL |
| 1 year - < 9 years | 6.2 - 10.3 mcg/dL | 6.2 - 10.3 mcg/dL |
| 9 years - < 12 years | 5.5 - 9.3 mcg/dL | 5.5 - 9.3 mcg/dL |
| 12 years - < 14 years | 5.0 - 8.3 mcg/dL | 5.0 - 8.3 mcg/dL |
| 14 years - < 19 years | 5.5 - 13.0 mcg/dL | 4.7 - 8.6 mcg/dL |
| > 19 years | 4.9 - 11.7 mcg/dL | 4.9 - 11.7 mcg/dL |
Interpretive Data:
Reference range is adapted from Abbott method literature and validated in our lab. Results by other manufacturers’ assays for this substance may not be equivalent to results by the Abbott assay and should not be interpreted interchangeably due to methodology differences.
Additional Test Codes
T4
Performing Laboratory Section
Chemistry / UMC MAIN LABORATORY