Collect: One 4 mL plain red. Also acceptable: 3 mL green (sodium or lithium heparin).
Transport: 4 mL serum or plasma at 2-8°C. (Min: 0.2 mL) Submit specimen in an ARUP Standard Transport Tube.
Pediatric Collection/Transport: 0.2 mL serum or plasma at 2-8°C.
Remarks: Remove serum or plasma from cells ASAP. Specimens should be collected eight to 12 hours (no earlier than six hours) after administration of oral dose.
Unacceptable Conditions: Separator tubes. Hemolyzed specimens. Specimens collected in sodium fluoride or potassium oxalate anticoagulants.
Stability: After separation from cells: Ambient: 8 hours; Refrigerated: 1 week; Frozen: 6 months
Reference Interval:
0.8-2.0 ng/mL Toxic: greater than 2.4 ng/mL
Interpretive Data:
The presence of therapeutic anti-digoxin immune fragments in the specimen may result in spuriously high digoxin levels.