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Is this discrepancy between DFP Impressions and Analytics Pageviews normal? - DoubleClick for Publishers Help

Is this discrepancy between DFP Impressions and Analytics Pageviews normal? - DoubleClick for Publishers Help

I understand that there will always be some discrepancy between the imrpessions reported in DFP and the number of pageviews in Analytics. I'm just wondering if the discrepancy I'm seeing is within the normal range or if there is possibly something that is preventing our ads from appearing on all pageviews.

I compared the total pageviews from Analytics for the first 10 days of February to the impressions for the same time period for one placement in DFP that contains the ad units for the skyscraper unit that appears once on each page of our site. I counted up all the impressions reported in DFP including AdSense and Unfilled, so in theory there should be one impression per pageview.

What I'm actually seeing is this:
Analytics Pageviews: 876,544
DFP Impressions: 698,429

So this is a 20% difference. Does this seem normal or could there be something wrong that's preventing impressions from serving somewhere?

Our url is www.crushable.com

Thanks in advance for any ideas or help you can provide!