Using standard field theory techniques we compute perturbative and instanton contributions\ud to the Coulomb branch of three-dimensional supersymmetric QCD with\ud N = 2 and N = 4 supersymmetry and gauge group SU(2). For the N = 4 theory\ud with one massless flavor, we confirm the proposal of Seiberg and Witten that\ud the Coulomb branch is the double-cover of the centered moduli space of two BPS\ud monopoles constructed by Atiyah and Hitchin. Introducing a hypermultiplet mass\ud term, we show that the asymptotic metric on the Coulomb branch coincides with the\ud metric on Dancer’s deformation of the monopole moduli space. For the N = 2 theory\ud with Nf flavors, we compute the one-loop corrections to the metric and complex\ud structure on the Coulomb branch. We then determine the superpotential including\ud one-loop effects around the instanton background. These calculations provide an\ud explicit check of several results previously obtained by symmetry and holomorphy\ud arguments
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