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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 Code899
CPT Codes
84443
Preferred Specimen
1 mL serum
Minimum Volume
0.7 mL
Instructions
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 TSH Ultra assay."
According to the assay manufacturer Siemens: "Samples containing fluorescein can produce falsely depressed values when tested with the Advia Centaur TSH Ultra assay."
Transport Container
Plastic screw-cap vial
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
Set up: Daily; Report available: Next 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.
