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Test Code LAB1917 Thyroid Stimulating Hormone w Reflex to T4

Performing Section

Chemistry

Purpose/Principle

For the quantitative determination of Thyroid Stimulating Hormone (TSH) in serum and plasma.

Special Collection Notes

For accurate results, serum and plasma should be free of fibrin, red blood cells, and other particulate matter

Specimen Type

Serum/Plasma:
Light Green Tube Top-Lithium Heparin (Preferred)
Gold Top Tube-SST
Red Top Tube-Plain

Specimen Volume

Preferred: 1.5 mL (0.4 mL Serum/Plasma)
Minimum: 0.9 mL ( 0.08 mL Serum/Plasma)

Processing Instructions

CENTRIFUGE sample per procedure.
Store and send sample refrigerated via courier.

Temperature

Refrigerated

Test Components

Hemolysis Index
Icterus Index
Turbidity Index
TSH

Reference Range

Hemolysis Index

This component has no reference ranges

 

Icterus Index

This component has no reference ranges

 

Turbidity Index

This component has no reference ranges

 

TSH

0 up to 3 Days: 1.0-20.0 mclU/mL

3 Days up to 1 Month: 0.5-6.5 mclU/mL

1 Month up to 5 Years: 0.5-6.0 mclU/mL

5 Years up to 13 Years: 0.5-5.5 mclU/mL

13 Years and up: 0.5-5.0 mclU/mL

TAT

Routine: 150 Minutes
STAT: 90 Minutes

Sample Stability

Ambient: Not recommended
Refrigerated: 7 days
Frozen @-20 Celsius: 4 weeks. Avoid repeated freeze/thaw cycles.

Additional Notes

Specimens with biotin concentrations up to 2 ng/mL demonstrated a less than or equal to 10% change in results. Biotin concentrations greater than this falsely decrease TSH results for patient samples.

 

Heterophilic antibodies in serum or plasma samples may cause interference in immunoassays.

 

The VITROS TSH Test has no high dose hook effect up to 5000 mcIU/mL.

 

Turbidity in specimens may affect test results.

Aliases

TSH

CPT

84443

Test/Batch Schedule

Runs daily-on demand

Method

Immunometric Chemiluminescence Immunoassay