You read the necromantic energy trapped in blood like a book. You immediately learn whether you have analyzed blood from the same creature before and when the last time you analyzed the blood was. You may only use the blood from a single creature for the material component of this spell. The information in mingled blood is too muddied to be of use. 

At Higher Levels: You may gain additional information from the blood you analyze by channeling more energy into the spell. The additional information you can gain is listed below. You gain all of the information provided by lower levels of the spell as well as the information provided by the spell level you chose.

2nd - You know the creature who shed the blood's type(s). (Monstrosity, Undead, Humanoid, etc.)
3rd - You know if the blood carries any diseases or poisons. You also know if the blood is acceptable for transfusion into another creature.
4th - You know if the creature whose blood you used is still alive.
5th - You know the creature's name (if applicable. Creatures with secret names such as Devils cannot have their secret name revealed with this spell.), age, and alignment.
6th - You know whether the creature is on the same plane of existence as you at the time the spell is cast.
7th - You know the approximate location of the creature with a margin of error of one mile.
8th - You have the memories of the creature for the last 12 hours prior to the blood being spilled.
9th - You have the memories of the creature for the last 24 hours prior to the blood being spilled.