Per Swedish Medical Center policy, post thyroid treatment patients are prescribed 74 mBq (2mCi (milliCuries)) for the treatment follow-up scan, and 185 mBq (5 mCi) for subsequent treatment if necessary. On 24 September 2004 a patient was prescribed 74 mBq (2 mCi) of NaI (
Iodine-131) for a post treatment scan. Instead, 191 mBq (5.16 mCi) of NaI (
Iodine-131) were administered. The prescribing physician realized that a misadministration had occurred on 27 September 2004 when the patient underwent the scan. A viable follow-up scan was able to be performed even though the misadministration had occurred.
There are multiple procedural checks in place to assure medical technicians administer the prescribed dose. Human error appears to have lead to checks not being performed prior to this event.
The Radiation Safety Officer for Swedish Medical Center notified the State of Washington, of the misadministration, on 27 September 2004.
The treating physician notified the patient on Monday, 27 September 2004, when the physician discovered the patient had been administered 191 mBq (5.16 mCi) of NaI (Iodine-131) instead of the prescribed 74 mBq (2 mCi) of NaI (Iodine-131).
Event Report Number WA-04--57