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HelpTest Code FT4 FREE THYROXINE (FT4)
Aliasis
T4 Free
Patient Preparation
No special patient preparations required
Collection Method
Venous collection
Minimum Volume
|
Adults |
1.0 mL |
|
Pediatric |
0.6 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
-Lavender (LAV) top
Reference or Target Ranges
|
Adults |
|
|
Euthryroid |
0.89 - 1.76 ng/dL |
|
Hypothyroid: |
< 0.89 ng/dL |
|
Hyperthyroid: |
> 1.76 ng/dL |
|
Pediatrics: |
|
|
Infants (1-23 months): |
0.94 - 1.44 ng/dL |
|
Children (2-12 years): |
0.86 - 1.40 ng/dL |
|
Adolescents (13-20 years): |
0.83 - 1.43 ng/dL |
Reportable Units
ng/dL
Critical Value
Not defined for this assay
Reasons for Rejection
|
Hemolysis Threshold: |
300 mg/dL |
|
Icterus Threshold: |
20 mg/dL |
|
Lipemia Threshold: |
1000 mg/dL |
|
Biotin: |
3500 ng/dL |
|
Other: |
QNS, contaminated, improperly labeled, improper specimen type |
Specimen Stability
|
Ambient |
8 Hours separated from cells |
|
Refrigerated |
48 Hours tightly capped |
|
Frozen |
If not assayed within 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
84439