DIGOXIN, FREE, SERUM

Specimen Required
Do not take biotin or any supplements containing biotin for 12 hours prior to testing.
Draw blood in a SST, 6-8 hours after last digoxin dose. Centrifuge within 2 hours of collection, remove serum from cells and send 1.0 mL serum (0.5 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Serum: Red-top

Methodology
Ultrafiltration followed by Electrochemiluminescent Immmunoassay

Stability
Room temperature: Unacceptable; Refrigerated: 7 days; Frozen: 180 days

Reference Range
>= 16 years:   0.4 - 0.9 ng/mL  
Toxic Concentration:   >=3.0 ng/mL  

Performed
Monday-Sunday

Turnaround Time2-3 days
Test CodeFRDIG
CPT-4 Code (s)
80163
LOINC Codes
Digoxin, Free, S   3562-6  

Warde
Medical
Laboratory