# How do I check whether OAS value is correct?

How do I check whether the Option-adjust spread value I have retrieved from external calc utility is correct? Can you please tell me the steps to verify this?

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Is this utility something you've written yourself, or is it an existing third-party service? – chrisaycock Mar 14 '12 at 16:09
It's an existing utility created by other team. – AksharRoop Mar 15 '12 at 9:48