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T-Uptake
Test CodeLAB135
Alias/See Also
1231100358
CPT Codes
84479
Includes
T3 UPTAKE RATIO
Preferred Specimen
Green Lithium Heparin tube (Gel separator preferred)
Minimum Volume
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
Transport Refrigerated.
Storage Requirements:
Room temperature: 24 hours
Refrigerated (2°C to 8°C): 14 days
Freezer (-20°C or colder): 30 days
Storage Requirements:
Room temperature: 24 hours
Refrigerated (2°C to 8°C): 14 days
Freezer (-20°C or colder): 30 days
Methodology
Abbott Alinity
Reference Range
Males/Females:
15.0-30.0%
15.0-30.0%
Performing Laboratory
LITTLE ROCK LABORATORY NORTH LITTLE ROCK LABORATORY
Last Updated: August 31, 2026
