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It might be better to consider the sampling technology, economic and logistical issues with this question as well as the tech behind the tests. First, some tests still will want a few milliliters of blood - e.g. cell counts for specific cell types. Then there is the need to create and stock many different kinds of sample collection devices and train the ...


There are several reasons why a lab might choose to get DNA from lymphocytes instead of whole blood. Generating genomic DNA from whole blood is not necessarily the best idea, as all the excess protein (mainly hemoglobin from RBCs) needs to be gotten rid of at some point. By narrowing down your input to just include cells that have DNA, you lessen the amount ...


Apparently there is a rare condition, sulfhemoglobinemia in which sulphide ions or H2S combine with the haem group in haemoglobin, causing a greenish colour. This can be related to certain drugs being present in the blood. See here for an example in which surgeons discovered dark green blood in their patient.


Is consumption of blood more "dangerous" compared to meat? Actually yes, a simple high dose of blood is enough to kill. The cause is, though it is most important thing to live when flowing the vessel, it's highly toxic when consumed. There are high chances of getting haemochromatosis or Iron overload. Source and More on this: ...

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