There is no question that the most popular time of year to visit the Valley is in winter. This is partly because the rest of the country is experiencing it's worst weather of the year and in contrast, Phoenix seems like summer. So accept that any time after September and before May is probably best.
RSV: RSV in clinical medicine is the abbreviation for respiratory syncytial virus. See: Respiratory syncytial virus.
MCV is an abbreviation standing for the mean corpuscular volume. It refers to the average volume of red blood cells in a being. MCV is affected either by increasing or decreasing due to the average size of a red blood cell. Take for instance, low MCV shows small red blood cell size, normal MCV shows normal red blood cell size and high MCV shows large red blood cell size. Sponsored link.