Dark Field Microscopy (DBM) is a qualitative analysis of blood which, by taking a small capillary drop (finger) and observing it under a microscope with "special features", makes it possible to identify changes/deviations in morphology (shape), movement, oxidation/toxins, among others in the blood.

The difference between this type of analysis/observation and "ordinary" analyses is that the former allows you to assess qualitatively and the latter quantitatively..