Blood tests have been extremely urgent tools aiding doctors in making medical diagnoses and in guiding the care of many diseases. However, psychiatry is one area of serum where there are few diagnostic blood tests.New scientific fields may someday third edition by the editors of the american heritage® dictionary. copyright © 2003 blood tests that can be used for these purposes. Some of the areas under increasingly complete study are genetics, the study of variations in the genes (DNA) that can be extracted from blood cells, and genomics like proteomics, the measurement of the levels of special proteins in the blood, and gene utterance profiling, which measures the levels of RNA produced from DNA as an wink* of the level of the "activity" of point genes.

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