Thyroid Stimulating Hormone (TSH) with Reflex to Free T4

Synonyms

  • LAB10537
  • TSH REFLEX FT4
  • TSH with Reflex to FT4

Cerner Name

Thyroid Stim Horm w/ FT4 reflex

Clinical Info

Test includes reflex to free T4 for TSH results outside the reference range.

Specimen Sources

Blood, Arterial Blood, Capillary Blood, Central Line Blood, Venous

Specimen Types

Blood

Specimen Volume

Container

Gold Top Tube

Collection Instructions

Serum *Preferred*
Container/Tube: Gold-top tube(s) 
Specimen: 1 mL of serum
Plasma
Container/Tube:  Mint green-top (lithium heparin gel) tube(s)Specimen:  1 mL of lithium heparin plasma

Transport Instructions

Refrigerated

Specimen Stability

8 Days Room Temperature
               14 Days  Refrigerated
               24 Months Frozen
 

Methodology

Electrochemiluminescence Immunoassay (ECLIA)
No Biotin interference up to 1200ng/mL

Days Performed

Monday through Sunday, Continuously

Performing Laboratories

Northwell Health Laboratories

CPT

84443-TSH
84439-FT4 (if appropriate)

PDM

5300437

Results
Component Name Base Name Common Name External Name
THYROID STIMULATING HORMONE W/FT4 REFLEX TSH TSH TSH

Result Interpretation

TSH: Units µIU/mL
     Age                                 Reference Range
0 – 5 days                            0.70 – 15.20
5 days – 2 months               0.70 – 11.00
2 months – 11 months         0.70 – 8.40
11 months – 5 years             0.70 – 6.00
5 years – 10 years               0.60 – 4.80
10 years – 19 years             0.50 – 4.30
19 years – 150 years           0.27 – 4.20
   
Free T4: 0.9-1.8 ng/dL
If TSH is <0.27 or >4.20, a Free T4 will be performed at an additional charge.

Forms
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Workgroup: Endocrine
Procedure Master Number: LAB10537
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