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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
TSH
Test CodeTSH3
Quest Code
899
CPT Codes
84443
Preferred Specimen
1 mL serum
Patient Preparation
Specimen collection after fluorescein dye angiography should be delayed for at least 3 days. For patients on hemodialysis, specimen collection should be delayed for 2 weeks.
According to the assay manufacturer Siemens: "Samples containing fluorescein can produce falsely depressed values when tested with the Advia Centaur TSH3 Ultra assay."
Minimum Volume
0.7 mL
Transport Container
Serum separator tube (SST)
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Plasma
Methodology
Immunoassay (IA)
Setup Schedule
Variable Sunday-saturday
Report Available
1 day
Reference Range
Premature Infants (28-36 Weeks) | |
1st Week of Life | 0.20-27.90 mIU/L |
Term Infants (>37 Weeks) | |
Serum or Cord Blood | 1.00-39.00 mIU/L |
1-2 Days | 3.20-34.60 mIU/L |
3-4 Days | 0.70-15.40 mIU/L |
5 Days-4 Weeks | 1.70-9.10 mIU/L |
1-11 Months | 0.80-8.20 mIU/L |
1-19 Years | 0.50-4.30 mIU/L |
≥20 Years | 0.40-4.50 mIU/L |
Pregnancy | |
First Trimester | 0.26-2.66 mIU/L |
Second Trimester | 0.55-2.73 mIU/L |
Third Trimester | 0.43-2.91 mIU/L |
Clinical Significance
For differential diagnosis of primary, secondary, and tertiary hypothyroidism. Also useful in screening for hyperthyroidism. This assay allows adjustment of exogenous thyroxine dosage in hypothyroid patients and in patients on suppressive thyroxine therapy for thyroid neoplasia.
Performing Laboratory
Quest Diagnostics LLC |
200 Forest Street, 3rd Floor, Suite B |
Marlborough, MA 01752-3023 |