It means "How about...?"
コーヒーはいかがですか?
Proposal: Would you like coffee?
その後いかが(お過ごし)ですか?
Question: How have you been?
Just いかがですか means several things but mostly; How do you like this or how do you think?
2016년 4월 29일
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It means 'how is..?'
具合(ぐあい)はいかがですか
How's your condition?