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We study the high-scale validity of two kinds of two Higgs doublet models(2HDM), namely, Type-II and Type-X, but with a scalar SU(2) singlet dark matter(DM) candidate in addition in each case. The additional quartic couplingsinvolving the DM particle in the scalar potential in both the scenarios bringin additional constraints from the requirement of perturbative unitarity andvacuum stability. DM relic density and direct search constraints play a crucialrole in this analysis as the perturbative unitarity of the DM-Higgs portalcouplings primarily decide the high scale validity of the model. We find that,within the parameter regions thus restricted, the Type-II scenario must have acut-off at around $10^6$ GeV, while the Type-X scenario admits of validity uptothe Planck scale. However, only those regions which are valid upto about $10^8$GeV in Type-X 2HDM is amenable to detection at the High-luminosity LHC (upto3000 $fb^{-1}$), while most of the parameter space of the Type-II scenariomentioned above is likely to be detectable.

High scale validity of two Higgs doublet scenarios with a real scalar singlet dark matter