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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 ​0.3 mL ​
​Plasma ​Lithium-heparin Green Top Tube or Sodium-heparin Green Top Tube (GTT) ​ ​2 mL ​0.3 mL ​
Collection Processing Instructions
Trough levels are most reproducible​
Specimen Stability Information
Specimen Type Temperature Time
​Serum or Plasma ​ Ambient temperature is acceptable for shipping and/or short-term storage ​ ​3 days
Specimen may also be refrigerated or frozen for longer storage.​
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ ​3 days
High Performance Liquid Chromatography with Ultraviolet Detection; (HPLC-UV)​
Reference Lab
Medtox Laboratories
Reference Range Information
Reference Range
Mephenytoin, ug/ml
Report Limit
0.5 ug/ml
Reference Range
1.0 - 5.0 ug/ml
Critical Value - High
20.0 ug/ml
 
Normephenytoin, ug/ml
Report Limit
0.5 ug/ml
Reference Range
15.0 - 35.0 ug/ml
Critical Value - High
50.0 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 ​0.3 mL ​
​Plasma ​Lithium-heparin Green Top Tube or Sodium-heparin Green Top Tube (GTT) ​ ​2 mL ​0.3 mL ​
Collection Processing
Trough levels are most reproducible​
Specimen Stability Information
Specimen Type Temperature Time
​Serum or Plasma ​ Ambient temperature is acceptable for shipping and/or short-term storage ​ ​3 days
Specimen may also be refrigerated or frozen for longer storage.​
Test Components
​Mephenytoin (Mesantoin®) and Normephenytoin
Reference Range Information
Reference Range
Mephenytoin, ug/ml
Report Limit
0.5 ug/ml
Reference Range
1.0 - 5.0 ug/ml
Critical Value - High
20.0 ug/ml
 
Normephenytoin, ug/ml
Report Limit
0.5 ug/ml
Reference Range
15.0 - 35.0 ug/ml
Critical Value - High
50.0 ug/ml
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ ​3 days
High Performance Liquid Chromatography with Ultraviolet Detection; (HPLC-UV)​
Reference Lab
Medtox Laboratories
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.