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Contrary to the starting assumption of Grbi\'c et al. (Phys. Rev. B 83,144508 (2011)), here we will first argue that a 16 T magnetic field is notenough to quench all superconducting fluctuations above Tc inYBa$_2$Cu$_3$O$_{7-\delta}$. We then conclude that through their measurementsof microwave absorption these authors actually determine the ac-fluctuationmagnetoconductivity at 16 T, instead of the zero-field ac paraconductivity asthey pretend. So, the temperature proposed by Grbi\'c et al. for the onset ofthe superconducting fluctuations, T', will correspond to the one at which thefinite-field effects at 16 T become measurable in their experiments, and theactual fluctuations onset will be located well above T'. These conclusions,which also concern influential recent publications on that issue, are thenconfirmed by analyzing some of the Grbi\'c et al., data on the grounds of theGaussian Ginzburg-Landau (GGL) approach for the finite-field (or Prange)fluctuation regime.

Comment on 'Temperature range of superconducting fluctuations above $T_c$ in YBa$_2$Cu$_3$O$_{7-\delta}$ single crystals'