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T3, Free
Test CodeLAB137
Alias/See Also
1231100266
CPT Codes
84481
Includes
T3, FREE
Preferred Specimen
CLINIC COLLECTIONS: Green Lithium Heparin tube (Gel separator preferred)
Minimum Volume
CLINIC COLLECTIONS: 0.5 mL plasma
Instructions
CLINIC COLLECTIONS: Collect 0.5 ml plasma in Green Lithium Heparin tube (Gel separator preferred). Must be spun within 2 hours after collection. If no gel separator, plasma must be pulled off cells within 2 hours.
If collecting with AST, ALT, VD25, K+, or LDH, label routes to Gold/SST. Collect 1.0 mL of serum in Gold/SST. Must be spun within 2 hours after collection.
If collecting with AST, ALT, VD25, K+, or LDH, label routes to Gold/SST. Collect 1.0 mL of serum in Gold/SST. Must be spun within 2 hours after collection.
Transport Temperature
Refrigerated
Specimen Stability
Refrigerated (2°C to 8°C): 7 days
Freezer (-10°C or colder): 6 months
If testing will be delayed more than 24 hours, remove serum or plasma from the clot, red blood cells, or separator gel.
Freezer (-10°C or colder): 6 months
If testing will be delayed more than 24 hours, remove serum or plasma from the clot, red blood cells, or separator gel.
Methodology
Abbott Alinity
Reference Range
Males/Females:
1.7-3.7 ng/mL
1.7-3.7 ng/mL
Performing Laboratory
LITTLE ROCK LABORATORY
Last Updated: August 26, 2026
