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HelpTest Code T4 TOTAL THYROXINE, T4
Aliasis
Total T4, Thyroxine
Patient Preparation
No special patient preparation required
Collection Method
Venous collection
Minimum Volume
1.0 mL
Container
Lt Green / Plasma Separator / Lithium Heparin
Preferred Specimen
Light Green Top (lithium heparin) plasma
Acceptable Specimen(s)
Serum:
-Gold Top SST
-Red Top
Plasma:
-Lt Green top (lithium heparin)
Reference or Target Ranges
|
Adults |
|
|
Euthryroid |
4.5-10.9 ug/dL |
|
Hypothyroid: |
0.0-5.5 ug/dL |
|
Hyperthyroid: |
10.8-19.1 ug/dL |
|
Pediatrics: |
|
|
Infants (1-23 months): |
6.0-13.2 ug/dL |
|
Children (2-12 years): |
5.5-12.1 ug/dL |
|
Adolescents (13-20 years): |
5.5-11-1 ug/dL |
Reportable Units
ug/dL
Critical Value
≤ 2.0 ug/dL
Reasons for Rejection
|
Hemolysis Threshold: |
500 mg/dL |
|
Icterus Threshold: |
20 mg/dL (conjugated) |
|
|
20 mg/dL (unconjugated) |
|
Lipemia Threshold: |
1000 mg/dL |
|
Other: |
QNS, contaminated, improperly labeled, improper specimen type |
Specimen Stability
|
Ambient |
8 Hour |
|
Refrigerated |
48 Hours |
Performance Information
|
Days and Time Performed |
24/7 |
|
Expected Turn Around Time |
Stat: 1 Hour, Routine: 4 Hours |
|
Stat Availability |
Yes |
|
Performing Bench |
CRMC Chemistry |
|
Methodology/Method Description |
Atellica |
Methodology/Method Description
Atellica CH Analyzer
CPT Codes
84436