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23149 Digoxin, Unbound, Serum or Plasma (191)

Digoxin, Unbound, Serum or Plasma (191)
Test Code: MISC
Synonyms/Keywords
Digibind®; Lanoxicaps®; Lanoxin®, Digoxin, Free, Free Digoxin​
Useful For

​Therapeutic Drug Management

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) ​3 mL ​1 mL
​Plasma ​Lithium-heparin Green Top Tube of Sodium-heparin Green Top Tube (GTT) ​3 mL ​1 mL
Collection Processing Instructions

​Trough levels are most reproducible.

Transfer separated serum or plasma to a plastic transport tube. 

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.​
Rejection Criteria
Serum Separator Tube (SST) Not Acceptable
​Plasma Separator Tube (PST) ​Not Acceptable
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ ​1-2 days
Ultrafiltration; Immunoassay (IA)
Reference Lab
Reference Range Information
Reference Interval
0.3-1.5 ng/mL
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
​80163
Synonyms/Keywords
Digibind®; Lanoxicaps®; Lanoxin®, Digoxin, Free, Free Digoxin​
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) ​3 mL ​1 mL
​Plasma ​Lithium-heparin Green Top Tube of Sodium-heparin Green Top Tube (GTT) ​3 mL ​1 mL
Collection Processing

​Trough levels are most reproducible.

Transfer separated serum or plasma to a plastic transport tube. 

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.​
Rejection Criteria
Serum Separator Tube (SST) Not Acceptable
​Plasma Separator Tube (PST) ​Not Acceptable
Useful For

​Therapeutic Drug Management

Reference Range Information
Reference Interval
0.3-1.5 ng/mL
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ ​1-2 days
Ultrafiltration; Immunoassay (IA)
Reference Lab
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
​80163
For most current information refer to the Marshfield Laboratory online reference manual.