An elevated D-dimer level is not normal. It is usually found after a clot has formed and is in the process of breaking down. If you are having significant formation and breakdown of blood clot in your body, your D-dimer may be elevated. A negative D-dimer test means that a blood clot is highly unlikely.
Purpose [edit]. Counting impressions is the method by which most Web advertising is accounted and paid for, and the cost is quoted in CPI (cost per impression) .
Impressions can be used to create mouth guards, whitening trays, retainers, crowns, bridges, veneers, dentures, and accurate models, among other things. A dental impression is an imprint of the teeth and mouth from which shaped items can be formed. 1  Dental impressions produce a close replica of your teeth and oral tissue. A metal or plastic horseshoe shaped tray is chosen to fit the teeth and gums comfortably. A tray can be molded for either the top teeth, the bottom teeth, or both.