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A red blood cell count is a blood test that your doctor uses to find out how many red blood cells (RBCs) you have in your blood. It is also called an erythrocyte count. The test is important because RBCs contain hemoglobin, which carries oxygen to your bodyâs tissues.
Rating Newest Oldest. Best Answer: Blood is bright red when it contains oxygen, and it is a dark reddish-maroon when it doesn't contain oxygen. It is never blue, even when it is inside the body. The blue color is simply the veins themselves with dark blood within. They show up as blue because they are under the skin, and blue is the only (visible) wavelength with enough energy to penetrate that deep and reflect back out.