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22696 Mephenytoin (Mesantoin) and Normephenytoin (68)

Mephenytoin (Mesantoin) and Normephenytoin (68)
Test Code: MISC
Synonyms/Keywords
Mesantoin®; Nirvanol​
Test Components
​Mephenytoin (Mesantoin®) and Normephenytoin
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
Serum​ ​Red Top Tube (RTT) ​2 mL ​0.5 mL
​Plasma ​Lithium-heparin Green Top Tube or Sodium-heparin Green Top Tube (GTT) ​2 mL ​0.5 mL
Collection Processing Instructions
Trough levels are most reproducible​
Specimen Stability Information
Specimen Type Temperature Time
​Serum or Plasma ​ ​ ​ Ambient​ ​3 days
​Refrigerated​2 weeks
​Frozen​6 months
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Thursday ​7 days
High Performance Liquid Chromatography with Ultraviolet Detection; (HPLC-UV)​
Reference Lab
Reference Range Information
Reference Range
Mephenytoin
1.0 - 5.0 ug/ml
 
Normephenytoin
15.0 - 35.0 ug/ml
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
80339 ​2
Synonyms/Keywords
Mesantoin®; Nirvanol​
Test Components
​Mephenytoin (Mesantoin®) and Normephenytoin
Ordering Applications
Ordering Application Description
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)
Pediatric Minimum Volume
(no repeat)
Serum​ ​Red Top Tube (RTT) ​2 mL ​0.5 mL
​Plasma ​Lithium-heparin Green Top Tube or Sodium-heparin Green Top Tube (GTT) ​2 mL ​0.5 mL
Collection Processing
Trough levels are most reproducible​
Specimen Stability Information
Specimen Type Temperature Time
​Serum or Plasma ​ ​ ​ Ambient​ ​3 days
​Refrigerated​2 weeks
​Frozen​6 months
Test Components
​Mephenytoin (Mesantoin®) and Normephenytoin
Reference Range Information
Reference Range
Mephenytoin
1.0 - 5.0 ug/ml
 
Normephenytoin
15.0 - 35.0 ug/ml
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Thursday ​7 days
High Performance Liquid Chromatography with Ultraviolet Detection; (HPLC-UV)​
Reference Lab
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
80339 ​2
For most current information refer to the Marshfield Laboratory online reference manual.