Geisinger Medical Laboratories Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  


Geisinger Epic Procedure Code: LAB3206             Geisinger Epic ID: 41920

Specimen type:
Plasma or serum
Preferred collection container:
Alternate Collection Container:
3 mL green/black top lithium heparin tube
Specimen required:
2 mL plasma or serum; minimum 0.5 mL

Specimen processing instructions:
Allow serum to clot. Centrifuge to separate serum or plasma within 2 hours of collection. 
Transport temperature:
Refrigerated (preferred) or frozen.
Specimen stability:
Refrigerated: 7 days. Frozen: 1 month.
Rejection criteria:
Stability limits exceeded.

Reference interval:
TSH: 0.27-4.2 uIU/mL
Free T4: 0.9 - 1.7 ng/dL.
Additional information:
Specimens containing human anti-mouse antibodies may affect results.
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Thyroid stimulating hormone (TSH) with an add-on of “Free T4” if the TSH is abnormal.
Thyroid Stimulating Hormone w/Free thyroxine if Thyroid Stimulating Hormone is abnormal
Clinical significance:
Typically, a small change in free T4 is accompanied by a big change in TSH. Thus, abnormal TSH levels often occur before free T4 abnormalities are detectable. This makes the “TSH w/FT4 if TSH is abnormal” test most suitable for screening for primary thyroid dysfunction and evaluation of thyroid nodule.
Doctoral Director(s:)
Hoi-Ying Elsie Yu, PhD, DABCC, FADLM
Sheng-Ying (Margaret) Lo, PhD, DABCC    
Review Date: 12/14/2022

Performing Locations

Geisinger Medical Center

Performing laboratory: Automated Chemistry
Technical Lead: Megan Woodruff
Frequency: Daily
Performed STAT? No

Geisinger Wyoming Valley Medical Center

Performing laboratory: ATL+
Technical Lead: Danielle Mostowski    
Frequency: Daily, all shifts    
Performed STAT? No

Geisinger Community Medical Center

Performing laboratory: Chemistry
Technical Lead: Ann Mack, Deborah Dempsey  
Frequency: Daily, all shifts    
Performed STAT? Yes

Geisinger Lewistown Hospital

Performing laboratory: Chemistry
Technical Lead: Jane Kifer  
Frequency: All shifts    
Performed STAT? Yes
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