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Thyroid Stimulating Hormone

Mnemonic

TSH

Synonym

TSH

Guidelines

If patient has undergone fluorescein dye angiography, we recommend repeat testing at least 72 hours post treatment (longer for renal insufficient patients). Specimens containing fluorescein can produce falsely low results when tested with this method.

Specimen Collection Requirements

Collect

Serum or Plasma, one 5.0 mL gold (SST), 7.0 mL red or 3.0 mL mint green (lithium heparin PST) top tube

Supply Item Number - 101235 , 101192 or 147641

Handling

Allow serum to clot completely at room temperature (minimum – SST: 30 minutes, red top tubes: 60 minutes). Centrifuge and separate serum or plasma from cells ASAP.

Preferred Volume

1.0 mL Serum/Plasma

Minimum Volume

0.5 mL Serum/ Plasma (1.2 mL minimum whole blood draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

  • Grossly hemolyzed specimens
  • Specimens thawed more than once

Stability

AFTER SEPARATION FROM CELLS: Room Temperature (18-26°C): 24 hours; Refrigerated (2-8°C): 4 days; Frozen (≤ -20°C): 1 month. Do not thaw more than once.

Testing Information

Performed

7 days/week

Reported

24 hours

Method

Chemiluminescent Immunoassay, Third Generation

Reference Values

Reference Values

Age

Male and Females

0 – 3 days

1.300 – 19.000 mIU/mL

3 days – 10 weeks

1.100 – 17.000 mIU/L

10 weeks – 14 months

0.600 – 10.000 mIU/L

14 months – 5 years

0.400 – 7.000 mIU/L

5 – 14 years

0.400 – 6.000 mIU/L

14 – 20 years

0.400 – 5.000 mIU/L

≥20 years

0.400 – 4.000 mIU/L

Comments

Legacy Laboratory Services has validated the use of lithium heparin plasma with this assay. Lithium heparin plasma has not been approved or cleared by the U.S. Food and Drug Administration (FDA) for use with this test. Legacy is authorized under Clinical Laboratory Improvement Amendments (CLIA) to perform high-complexity testing.

CPT Codes

84443

Last Updated: Thursday, February 11, 2021 08:22:36 PM


Client Services: 503-413-1234