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) .
1. a strong effect produced on the intellect, feelings, or senses. 2. the effect produced by an agency or influence. 3. a somewhat vague awareness: a general impression of distant voices. 4. a mark produced by pressure. 5. an image in the mind caused by something external to it.. an effect produced in the mind by a stimulus; sensation: he gave the impression of wanting to help. 2. an imprint or mark produced by pressing: he left the impression of his finger in the mud.