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Test ID THCSM Thyroid Function Cascade, Monitor (without Thyroid Peroxidase Antibody), Serum


Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1.5 mL

Collection Instructions: Within 2 hours of collection, centrifuge and aliquot serum into a plastic vial.


Useful For

Monitoring patients diagnosed with thyroid disease

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
FRT4C T4 (Thyroxine), Free, S Yes No
T3C T3 (Triiodothyronine), Total, S Yes No

Testing Algorithm

If thyrotropin (TSH) is less than 0.3 mIU/L, then free T4 (FT4, thyroxine) will be performed at an additional charge.

 

If free T4 is normal and the TSH is less than 0.1 mIU/L, then T3 (triiodothyronine) will be performed at an additional charge.

 

If TSH is greater than 4.2 mIU/L, then free T4 will be performed at an additional charge.

Method Name

Electrochemiluminescent Immunoassay (ECLIA)

Reporting Name

Thyroid Cascade (Monitor), S

Specimen Type

Serum

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  30 days
  Ambient  72 hours

Reference Values

0-5 days: 0.7-15.2 mIU/L

6 days-2 months: 0.7-11.0 mIU/L

3-11 months: 0.7-8.4 mIU/L

1-5 years: 0.7-6.0 mIU/L

6-10 years: 0.6-4.8 mIU/L

11-19 years: 0.5-4.3 mIU/L

≥20 years: 0.3-4.2 mIU/L

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 to 2 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

84443

84439-(if appropriate)

84480-(if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
THCSM Thyroid Cascade (Monitor), S 11579-0

 

Result ID Test Result Name Result LOINC Value
STSHM TSH, Sensitive, S 11579-0