Geisinger Medical Laboratories Test Catalog

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


Geisinger Epic Procedure Code: LAB2844             Geisinger Epic ID: 6356

Specimen type:
Serum or plasma
Preferred collection container:
Alternate Collection Container:
3.5 mL gold-top (serum separator) tube
3 mL green/yellow-top (plasma separator) tube
Specimen required:
2 mL serum or plasma; minimum 0.2 mL.
Special notes:
See specimen processing instructions.
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. Specimens in SST or PST must be aliquoted within 24 hours of collection. 
Transport temperature:
Refrigerated (preferred) or frozen.
Specimen stability:
Room temperature: 4 days. Refrigerated: 4 days. Frozen: 1 month.
Rejection criteria:
Specimens in SST or PST not aliquoted within 24 hours of collection.

Reference interval:
Therapeutic Range: 10-20 mcg/mL.
Critical values/courtesy alerts:
Above 30 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.
Dilantin, PHNY
Clinical significance:
Phenytoin is an anticonvulsant hydantoin used for the treatment of generalized grand mal and complex partial seizures. Phenytoin is also used in neurosurgical procedures. Phenytoin levels are monitored to assure adequate theraepeutic 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

Geisinger Wyoming Valley Medical Center

Performing laboratory: ATL+
Technical Lead: Danielle Mostowski    
Frequency: Daily, all shifts    
Performed STAT? Yes

Geisinger Community Medical Center

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

Geisinger South Wilkes-Barre

Technical lead: Bernadette Johnson    
Frequency: Daily, all shifts    
Performed STAT? Yes
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