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23076 T-Uptake

T-Uptake
Test Code: T-3
Synonyms/Keywords
T-Uptake, T3 Uptake​
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Serum​ Red Top Tube (RTT)​ Serum Separator Tube (SST)​ 0.5 mL​ 0.4 mL​ 0.3 mL​
Collection Processing Instructions
Samples collected in a RTT must be removed from the cells within one hour for storage or transport. Samples collected in an SST must be removed from primary tube within 4 hours for transport.​
Specimen Stability Information
Specimen Type Temperature Time
Serum​ Ambient​ 8 hours​
Serum​ Refrigerated​ 7 days​
Serum​ Frozen​ 30 days​
Interference
Human Anti-Murine Antibodies (HAMA) may develop leading to test interference in patients receiving murine-based agents for chemotherapy or tumor-imaging studies.​
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday​ Less than 2 hours​ Beckman Chemiluminescent Immunoassay  ​
Reference Range Information
Performing Location Reference Range
Marshfield​ 33 - 46%​
Interpretation
Free Thyroxine Index (FTI, T7): 1.9 - 4.2. Requires separate order of Thyroxine, Total for calculation of Free Throxine Index. Multiply T-Uptake and Thyroxine, Total to obtain Free Thyroxine Index.​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
84479​ ​ ​ ​ ​
Synonyms/Keywords
T-Uptake, T3 Uptake​
Ordering Applications
Ordering Application Description
​Centricity ​T Uptake (T3 Uptake)
​Cerner ​T3 Uptake
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Serum​ Red Top Tube (RTT)​ Serum Separator Tube (SST)​ 0.5 mL​ 0.4 mL​ 0.3 mL​
Collection Processing
Samples collected in a RTT must be removed from the cells within one hour for storage or transport. Samples collected in an SST must be removed from primary tube within 4 hours for transport.​
Specimen Stability Information
Specimen Type Temperature Time
Serum​ Ambient​ 8 hours​
Serum​ Refrigerated​ 7 days​
Serum​ Frozen​ 30 days​
Interference
Human Anti-Murine Antibodies (HAMA) may develop leading to test interference in patients receiving murine-based agents for chemotherapy or tumor-imaging studies.​
Reference Range Information
Performing Location Reference Range
Marshfield​ 33 - 46%​
Interpretation
Free Thyroxine Index (FTI, T7): 1.9 - 4.2. Requires separate order of Thyroxine, Total for calculation of Free Throxine Index. Multiply T-Uptake and Thyroxine, Total to obtain Free Thyroxine Index.​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday​ Less than 2 hours​ Beckman Chemiluminescent Immunoassay  ​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
84479​ ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.