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Test Code TSHR TSH REFLEX

Methodology

Chemiluminescent Immunometric Assay (Ultrasensitive)

If TSH is <0.465 µIU/mL or >4.68 µIU/mL, free thyroxine (T4) will be performed at an additional charge.

Useful as a primary screening test for thyroid function.

Specimen Requirements

 

Submit only 1 of the following specimens:

 

Preferred:

Serum Gel Tube

Container/Tube: Serum gel tube(s)
Specimen Volume: 2 mL (minimum volume: 1 mL) of serum

Collection Instructions: Spin down within 4 hours of draw.

 

Alternate:

Plain, Red-Top Tube

Container/Tube: Plain, red-top tube(s)
Specimen Volume: 2 mL (minimum volume: 1 mL) of serum

Collection Instructions: Spin down within 4 hours of draw.

Day(s) Test Set Up

Monday through Friday

Reference Values

< 3 Days                                                1.00 – 20.0

3 – 30 Days                                           0.50 – 6.50

1 Month – 5 Months                            0.50 – 6.00

≥ 6 Months                                            0.47 – 4.68 µIU/mL

 

Performing Laboratory

Logan Health Medical Center-Chemistry

Test Classification and CPT Coding

84443-TSH

84439-Free T4 (if appropriate)

Specimen Transport Temperature

Refrigerate