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MISC - Mill Certification/Higher Yield Stress

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Has anyone been involved with a structural steel design in which the
corresponding mill certification indicated a yield stress greater than that
assumed within your design? For example, you specified ASTM A572 Grade 50 and
the mill certification indicates a 59 ksi yield stress. Does the 9th edition
ASD or the 2nd edition LRFD specifications prohibit the use of the higher
yield stress? Other issues such as serviceability would have to be considered
but I occassionally encounter a situation(such as a field change, User
revision, etc.) where use of the certified higher yield stress would prevent
replacement/reinforcement of a member.

Charlie Canitz, PE
Bel Air, MD