Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

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

PHENYTOIN, FREE LEVEL

ORDERING INFORMATION:
Geisinger Epic Procedure Code: LAB2843         Geisinger Epic ID: 6357

SPECIMEN COLLECTION
Specimen type:
Serum
Preferred collection container:
Alternate Collection Container:
3.5 mL gold-top (serum separator) tube
Specimen required:
4 mL aliquot of serum ; minimum 2 mL
Patient preparation:
Trough level: Immediately before next dose.
Peak level: Two (2) hours after IV push, eight (8) hours after oral suspension.

SPECIMEN PROCESSING
Specimen processing instructions:
Allow serum to clot. Centrifuge to separate serum. Serum collected in serum separator tubes must be aliquoted within 24 hours of collection. 
Transport temperature:
Frozen.
Specimen stability:
Refrigerated: 24 hours. Frozen: 1 month.
Rejection criteria:
Stability limits exceeded.

TEST DETAILS
Reference interval:
Therapeutic Range: 1.0 - 2.0 ug/mL.
Critical values/courtesy alerts:
> or = 3.0 ug/mL
CPT code(s):
80186
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:
Phenytoin, free.
Methodology:
Immunoassay
Synonyms:
Dilantin, Unbound or Free; Free Dilantin; Free Phenytoin; Phenytoin Free; Phenytoin Unbound; PHNYUB; Unbound phenytoin
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
Sheng-Ying (Margaret) Lo, PhD, DABCC    
Review Date: 01/30/2021

Performing Locations

Geisinger Medical Center

Performing laboratory: Toxicology
Technical Lead: Michael Sneidman
Frequency: Daily, all shifts.
Performed stat? Yes
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