Digoxin Level


Sunquest Code:DIGX  
Epic Code:LAB23Epic Name:Digoxin Level
Synonyms:Lanoxin Level; DIGX
Methodology:Chemiluminescence
CPT Code:80162
Turnaround Time:Performed and reported 24 hours/day.
Special Instructions:Elevated results may occur if blood is collected less then 6 hours after last dose.


Collection Instructions

Specimen:Blood
Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Collection Instructions:Collect a minimum of 6 hours after last dose.
Causes for Rejection:Gross hemolysis; collected less than 6 hours post dose.
Contraindications:Do not order level if patient is on digitoxin or any other cardiac glycoside.


Processing and Shipping

Specimen Processing:Centrifuge and aliquot within 2 hours of collection 1.25 mL, 0.2 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Chemistry  (Fairview Range - FRMC, UMMC-East Bank, Fairview Lakes - FLMC, Fairview Ridges - FRH, Fairview Northland - FNMC, Fairview Southdale - FSH, UMMC/UMMCH-West Bank, Grand Itasca GICH)


Interpretive

Critical Range:Greater than 2.5 ug/L
Therapeutic Range:Adults: 0.5-2.0 ug/L. The reference range for infants (less than 3 mo) is thought to be 3.0-4.0 ug/L; infants tolerate more digoxin because they have more binding sites and an increased metabolic rate.
Limitations:2 years and up: 0.7-1.8 ug/L
Use:Monitor therapeutic dosing and evaluate toxicity. Half-life is 36-44 h (adult); 12-24 h (child); 18-33 h (infant); and 35-88 h (neonate).


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