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Lab Test Dictionary

Thyroid Cascading Reflex (15102)

Methodology

Immunoassay (IA)


Synonyms

Cascade; RFLX*QST TSH (15102-1)

Specimen Type

Serum

Performing Lab

Quest Diagnostics San Juan Capistrano


Epic ID

LAB01618

Lab Test Days

Tuesday and Thursday

Standard TAT

3-8 Days


Collection Information

Specimen Required

4.5-8 mL Blood

Container Type

Red Top (No Additive)

Collection Instructions

This assay should only be ordered on patients 1 year of age or older. Orders on patients younger than 1 year will have a TSH only performed.


Processing Information - Lab Use Only

Transport Temperature

Refrigerate-OK/Frozen-OK

Specimen Stability

Room Temp=4 Days; Refrigerated=7 Days; Frozen=28 Days

Test Volume Required

4 mL Serum

Minimum Test Volume

2.2 mL Serum


Included Tests

The Thyroid Cascading Reflex begins with a TSH. If the TSH result is abnormal, T4, Free will be performed. If the TSH is elevated and the T4, Free is either normal or low, TPO Antibodies will be performed. If the TSH is low and the T4, Free is either normal or low, T3, Free will be performed. Note: This assay should only be ordered on patients 1 year of age or older. Orders on patients younger than 1 year will have a TSH only performed


Comments

This assay should only be ordered on patients 1 year of age or older. Orders on patients younger than 1 year will have a TSH only performed.


CPT Codes

84443; 84439; 86376; 84481


Revised

03-03-21

Initials

SL