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Epic Code LAB31 Phenytoin, Total, Blood Level

Test Name Alias

Phenytoin Total Blood Level | Dilantin | Diphenylhydantoin | 8231

Interface Order Alias

10218

Ordering Instructions

Inpatients: Please contact your local inpatient pharmacy for information regarding appropriate timing for blood drug level orders, if needed.

Collection Instructions

Specimen Collection: Blood

 

Container(s): 4.5 mL Mint Green Top (Lithium Heparin Gel) or 5.0 mL Gold Top (Serum Separator-SST Gel)*

Preferred Volume to Collect: 4.5 mL

Minimum Volume to Collect: 1.0 mL

Neonate Volume to Collect: 0.5 mL

Capillary collect ok? Yes

Microtainer acceptable: Yes

 

Collection Instructions:

  • Indicated date and time of last dose.

  • Specimen usually collected as trough level.

  • Avoid gross hemolysis

  • After collection, gently invert tube 8-10 times.
  • Specimen should be processed within 2 hours – See Processing Instructions.

*Red top (plain) or Green top (Lithium Heparin, Non-Gel) are also acceptable specimen containers.

 

Processing Instructions (Laboratory, Outpatient or Off-site collection)

Processed Specimen: Plasma or Serum

Centrifuge/Spin: Yes

Aliquot: Yes

 

Processing Instructions:

  • Plasma is preferred specimen type
  • Green Tube/Plasma: Centrifuge after collection.
  • Gold Tube/Serum: Allow blood to clot for 30 minutes in a vertical position and centrifuge within 2 hours.

Transport Temperature: Refrigerate

Specimen Stability

Ambient: 8 hours

Refrigerate: 4 days capped

Frozen: 1 month capped (serum). Do not freeze lithium heparin plasma

Laboratory Retention: 72 hours

Test Frequency

Available 24 hours, usual TAT 1 day.

Reference Range

10.0 – 20.0 mcg/mL

 

Laboratory Critical Values Table

Performing Department

Chemistry

Performing Department Laboratory Location

Corewell Health Reference Laboratory, Grand Rapids, MI
Corewell Health Big Rapids Laboratory, Big Rapids, MI
Corewell Health Gerber Laboratory, Fremont, MI
Corewell Health Kelsey Laboratory, Lakeview, MI
Corewell Health Ludington Laboratory, Ludington, MI
Corewell Health Pennock Laboratory, Hastings, MI
Corewell Health Reed City Laboratory, Reed City, MI
Corewell Health Greenville Laboratory, Greenville, MI
Corewell Health Zeeland Laboratory, Zeeland, MI
Corewell Health Lakeland St. Joseph Laboratory, St. Joseph, MI
Corewell Health Lakeland Niles Laboratory, Niles, MI

Methodology

Kinetic Interaction of Micro particles in a Solution (KIMS)

CPT

80185

CDM Code

3018018501

Epic Test ID

1230101038

LOINC

Phenytoin Total Lvl: 3968-5

Reviewed Date

3/7/2024