Errors in Medical Interpretation and Their Potential Clinical Consequences
in Pediatric Encounters
Glenn Flores, MD*, M. Barton Laws, PhD||,
Sandra J. Mayo, EdM||, Barry Zuckerman, MD,
Milagros Abreu, MD*,,
Leonardo Medina, MD
and Eric J. Hardt, MD
* Center for the Advancement of Urban Children, Department of
Pediatrics, Medical College of Wisconsin, Milwaukee, Wisconsin Departments of
Pediatrics Internal Medicine, Boston
University School of Medicine, Boston, Massachusetts || Latino Health Institute, Boston, Massachusetts
Background. About 19 million people in the United States arelimited in English proficiency, but little is known about the
frequency and potential clinical consequences of errors in medical
interpretation.
Objectives. To determine the frequency, categories, and potentialclinical consequences of errors in medical interpretation.
Methods. During a 7-month period, we audiotaped and transcribedpediatric encounters in a hospital outpatient clinic in whicha
Spanish interpreter was used. For each transcript, we categorized
each error in medical interpretation and determined whethererrors
had a potential clinical consequence.
Results. Thirteen encounters yielded 474 pages of transcripts.Professional hospital interpreters were present for 6 encounters;ad hoc interpreters included nurses, social workers, and an
11-year-old sibling. Three hundred ninety-six interpreter errorswere
noted, with a mean of 31 per encounter. The most commonerror type
was omission (52%), followed by false fluency (16%),substitution
(13%), editorialization (10%), and addition (8%).Sixty-three percent
of all errors had potential clinical consequences,with a mean of 19
per encounter. Errors committed by ad hocinterpreters were
significantly more likely to be errors ofpotential clinical
consequence than those committed by hospitalinterpreters (77% vs
53%). Errors of clinical consequence included:1) omitting questions
about drug allergies; 2) omitting instructionson the dose,
frequency, and duration of antibiotics and rehydrationfluids; 3)
adding that hydrocortisone cream must be appliedto the entire body,
instead of only to facial rash; 4) instructinga mother not to answer
personal questions; 5) omitting thata child was already swabbed for
a stool culture; and 6) instructinga mother to put amoxicillin in
both ears for treatment of otitismedia.
Conclusions. Errors in medical interpretation are common, averaging31 per clinical encounter, and omissions are the most frequent
type. Most errors have potential clinical consequences, andthose
committed by ad hoc interpreters are significantly morelikely to
have potential clinical consequences than those committedby hospital
interpreters. Because errors by ad hoc interpretersare more likely
to have potential clinical consequences, third-partyreimbursement
for trained interpreter services should be consideredfor patients
with limited English proficiency.
Key Words: language interpreters medical errors
children pediatrics Hispanic Americans quality
Abbreviations: LEP, limited in English proficiency SD,
standard deviation
Received for publication Jan 29, 2002; accepted May 24, 2002.
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