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24901 Methylphenidate (79)

Methylphenidate (79)
Test Code: RITALSO
Synonyms/Keywords
Ritalin®​
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 ​0.6 mL ​
​Plasma ​Lithium-heparin Green Top Tube or Sodium-heparin Green Top Tube (GTT) ​ ​2 mL ​0.6 mL ​
Collection Processing Instructions
Spin down and freeze immediately.
Peak levels occur at 1-3 hours post dose; trough levels often not detectable.
Specimen Stability Information
Specimen Type Temperature
​Serum or Plasma
Freeze immediately; ship frozen on dry ice.​
Rejection Criteria
Serum Separator Tube (SST) Reject
​Samples not frozen ​Reject
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ 3 days​
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)​
Reference Lab
Medtox Laboratories
Reference Range Information
Performing Location Reference Range`
Medtox Laboratories​
Report Limit
1.0 ng/ml
Reference Range
5.0 - 20.0 ng/ml
Critical Value - High
40.0 ng/ml​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​80360 ​ ​ ​ ​
Synonyms/Keywords
Ritalin®​
Ordering Applications
Ordering Application Description
​Centricity ​Methylphenidate, Blood (79)
​Cerner ​Ritalin Level (79)
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 ​0.6 mL ​
​Plasma ​Lithium-heparin Green Top Tube or Sodium-heparin Green Top Tube (GTT) ​ ​2 mL ​0.6 mL ​
Collection Processing
Spin down and freeze immediately.
Peak levels occur at 1-3 hours post dose; trough levels often not detectable.
Specimen Stability Information
Specimen Type Temperature
​Serum or Plasma
Freeze immediately; ship frozen on dry ice.​
Rejection Criteria
Serum Separator Tube (SST) Reject
​Samples not frozen ​Reject
Reference Range Information
Performing Location Reference Range`
Medtox Laboratories​
Report Limit
1.0 ng/ml
Reference Range
5.0 - 20.0 ng/ml
Critical Value - High
40.0 ng/ml​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ 3 days​
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)​
Reference Lab
Medtox Laboratories
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​80360 ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.