Digoxin, Unbound, Serum or Plasma

CPT: 80163
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  • Digitek®
  • Digox®
  • Lanoxin®

Expected Turnaround Time

2 - 5 days

Specimen Requirements


Serum or plasma


3 mL

Minimum Volume

1.2 mL


Red-top tube or green-top (heparin) tube


Serum or plasma should be separated from cells within two hours of venipuncture. Submit serum or plasma in a plastic transport tube.

Storage Instructions

Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen. Specimen is stable for three days at room temperature, for two weeks refrigerated, and for six months frozen.

Causes for Rejection

Gel-barrier tubes

Test Details


Therapeutic drug management; management of digoxin overdose post Digibind®


Ultrafiltration; immunoassay (IA)

Reference Interval

0.3−1.5 ng/mL


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
790952 Digoxin, Unbound 3562-6 790955 Digoxin, Unbound ng/ml 3562-6
790952 Digoxin, Unbound 3562-6 790957 Digoxin, Unbound N/A

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