It should be a finger. At present, trace elements are all peripheral blood, and most of the blood collected is very small, 40 microliters, which is the amount of two drops of blood. You can rest assured.

Hair can also be used as upstairs said, but hair testing is generally troublesome, and hospitals may not be willing to do it, and the trace elements in hair testing represent the trace element content in the previous stage, so it is better to use blood, not too much.

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