Geisinger Medical Laboratories Test Catalog

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


Geisinger Epic Procedure Code: LAB3148             Geisinger Epic ID: 6363

Specimen type:
Serum or plasma
Preferred collection container:
Specimen required:
2 mL aliquot of serum or plasma; minimum 0.2 mL.
Patient preparation:
Collect just prior to next dose.

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: 1 week. Frozen: 60 days.
Rejection criteria:
Stability limits exceeded.

Reference interval:
Therapeutic range: 10-20 mcg/mL.
Critical values/courtesy alerts:
Above 21.0 mcg/mL.
Additional information:
Significant interference with this procedure may occur in patients with antibodies induced during treatment with mouse monoclonal antibodies.
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:
Enzyme Immunoassay (EIA)
Aminophylline, Elixophyllin, THEO
Clinical significance:
Theophylline is used in the treatment of bronchial asthma as well as the treatment of chronic obstructive pulmonary disease and episodes of prolonged apnea in preterm infants. Theophylline levels are monitored to assure adequate therapeutic levels are achieved and to avoid toxicity.
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, Monday - Sunday
Performed STAT? Yes
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