A patient is about to begin therapy with ethambutol. The nurse knows that, before initiating treatment with this drug, it is important to obtain which test(s)?
a. Color vision and visual acuity
b. Complete blood cell (CBC) count
c. Hearing testing and a tympanogram
d. Hepatic function tests
ANS: A
Optic neuritis is a dose-related adverse effect of ethambutol. Patients receiving this drug should have color vision and visual acuity testing before therapy starts and periodically thereafter. A CBC, hearing evaluations, and hepatic function testing are not recommended.
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