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22622 Felbamate

Felbamate
Test Code: FELB
Synonyms/Keywords
Felbatol​
Useful For
This test is useful for monitoring felbamate in blood.  Felbamate is a relatively non-toxic drug that is not associated with major side effects in higher concentrations.  ​
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Serum​ Red Top Tube (RTT)​ 0.5 mL​ 0.5 mL​ 0.3 mL​
Collection Processing Instructions

Specimen should be collected prior to dosing.  Please indicated collection time.

Separate serum/plasma from cells within 2 hours of collection.

Specimen Stability Information
Specimen Type Temperature Time
​ Serum​ ​Ambient ​48 hrs
Refrigerate​ 2 weeks
Frozen 2 weeks
Rejection Criteria
​​Specimens collected in serum or plasma separator tubes
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday, Wednesday, Friday​ 1 day​
UPLC MS/MS - Waters Acquity UPLC, XEVO TQ-S Tandem Mass Spectrometry System​
Samples must be in performing department by 8am on day of testing for results the same day.​ ​ ​ ​​ ​ ​
Testing may be batched and set up on alternative days of the week as needed. ​
Test Information
This test was developed and its performance characteristics determined by Marshfield Labs.  It has not been cleared or approved by the US Food and Drug Administration.  This test is used for clinical purposes.  It should not be regarded as investigational or for research.
Reference Range Information
Performing Location Reference Range
Marshfield​ Patients receiving a maximum 3600 mg dose show typical serum felbamate levels of 50-80 ug/mL with a range of 25-135 ug/mL, without toxicity.​
Interpretation
​Trough concentrations are most accurate and recommended for therapeutic drug monitoring. Preferably obtained just before the next dose.
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
80167
 ​ ​1 ​ ​
Synonyms/Keywords
Felbatol​
Ordering Applications
Ordering Application Description
​Cerner ​Felbamate Level
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Serum​ Red Top Tube (RTT)​ 0.5 mL​ 0.5 mL​ 0.3 mL​
Collection Processing

Specimen should be collected prior to dosing.  Please indicated collection time.

Separate serum/plasma from cells within 2 hours of collection.

Specimen Stability Information
Specimen Type Temperature Time
​ Serum​ ​Ambient ​48 hrs
Refrigerate​ 2 weeks
Frozen 2 weeks
Rejection Criteria
​​Specimens collected in serum or plasma separator tubes
Useful For
This test is useful for monitoring felbamate in blood.  Felbamate is a relatively non-toxic drug that is not associated with major side effects in higher concentrations.  ​
Reference Range Information
Performing Location Reference Range
Marshfield​ Patients receiving a maximum 3600 mg dose show typical serum felbamate levels of 50-80 ug/mL with a range of 25-135 ug/mL, without toxicity.​
Interpretation
​Trough concentrations are most accurate and recommended for therapeutic drug monitoring. Preferably obtained just before the next dose.
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday, Wednesday, Friday​ 1 day​
UPLC MS/MS - Waters Acquity UPLC, XEVO TQ-S Tandem Mass Spectrometry System​
Samples must be in performing department by 8am on day of testing for results the same day.​ ​ ​ ​​ ​ ​
Testing may be batched and set up on alternative days of the week as needed. ​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
80167
 ​ ​1 ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.