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THYROID STIMULATING HORMONE WITH REFLEX

Mnemonic

TSHR

Synonym

TSH, Free Thyroxine, Free T4

Includes

TSH, Free T4 if abnormal

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 the TSH method.

Specimen Collection Requirements

Collect

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

Supply Item Number - 101235 or 101192

Handling

Allow serum to clot completely at room temperature (minimum: 30 minutes). Centrifuge and separate serum and plasma from cells ASAP.

Preferred Volume

1.5 mL Serum/Plasma

Minimum Volume

0.75 mL Serum/ Plasma (1.8 mL minimum whole blood draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

Grossly hemolyzed specimens

Stability

AFTER SEPARATION FROM CELLS: Room Temperature (18-26°C): 8 hours; Refrigerated (2-8°C): 4 days; Frozen (≤ -20°C): 1 month

Testing Information

Performed

7 days/week

Reported

24 hours

Method

Chemiluminescent Immunoassay, Third Generation

Reference Values

Reference Values

Comments

Any low or high TSH result will automatically reflex to a Free T4.

CPT Codes

TSH: 84443, FT4: 84439

Last Updated: Tuesday, March 7, 2017 03:58:20 PM


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