Media function testing should be performed on commercially prepared media when:
a. organisms expected to grow on the media demonstrate growth.
b. daily as required.
c. on all new lots of media.
d. only when the identity and growth cha-racteristics appear abnormal.
D
Quality control on commercially manufactured media does not typically require functional testing unless the media is demonstrating unusual growth characteristics or failing to function ap-propriately (i.e. proper color change or growth using quality control organisms).
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