I'd talk to your doctor ASAP. Hemochromatosis is Iron overload...and the color of the blood reflects your iron status.
Testing for hemochromatosis or polycythemia vera (too many red cells which is a different disorder) involves,
total ferritin levels, and total blood iron. This genetic issue is more common than believed, and testing for it is not complicated, expensive or painful.
Hemochromatosis is not tested for in regular blood work, and has to be ordered separately.
Venous blood is darker than arterial, but shouldn't be "blackish".
I've had blood taken with a butterfly needle which does burst red cells, and my potassium is typically higher because of this.
But it has never looked blackish.
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Weezie looking at petunias 8.25.2017
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