In this paper we havepresented sanchez�sapproach for metal work designer�s medical diagnosis using the complement of interval-valued fuzzy soft sets and exhibit the technique with a hypothetical case study.Most of our real life problems in economics, engineering, medical sciences, management, environment and social sciences etc., involve imprecise data and the solution involves the use of mathematical principles based on uncertainty and imprecision.Such uncertainties are being dealt with the help of the topics like probability fuzzy set theory,intuitionistic fuzzy sets,vague sets, theory of interval mathematics, rough sets etc. Although, Molodtsov has shown that every one of the above topics don�t posses of their parametrizationtools and overcome this shortcoming,introduceda concept called �Soft set theory�, having parametrization tools for prosperous dealing with various types of uncertainties.The