 - Reading of the MIC After complete the period of incubation and when bacterial growth become distinctly visible, read the MIC value at the point of intersection between the inhibition ellipse edge and the E test strip. Use the E test reading Guide and other technical guides to correctly read different patterns. Etest strip AB Biodisk, Solna, Sweden containing cefepime MIC test range, 0.25-16 mgL and cefepime MIC test range, 0.064-4 mgL plus 4 mgL clavulanic acid will be used to detect the expression of ESBL according to the manufacturers instruction.reduction of MIC by 3 two-fold dilutions in the presence of clavulanic acid is indicator of ESBL production. Deformation of the ellipses or the presence of phantom zone is also indicator of ESBL production even if the MIC ratio is 8 or can not be read. 