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What is dark blood test?

What is dark blood test?

Best Answer: just means that you have a lot of hemoglobin in your blood and carry a lot of life giving oxygen. don’t sweat it. All blood cells contain small amounts of iron, which turns red when it comes into contact with oxygen. This is why blood is usually bright red, as blood cells pick up oxygen when they pass through the pulmonary circulation and they carry it to cells around the body.While blood in the arteries usually contains a lot of oxygen, blood in the veins is bringing carbon dioxide back from the body’s tissues so it can pass through the lungs and heart to acquire oxygen again.

As a result, it is usually darker than the blood in the arteries. The same applies to blood in the capillaries that are feeding the veins.Once deoxygenated blood reaches the heart again, it moves through the right atrium and into the right ventricle. From there, the right ventricle pumps it into the pulmonary circulation, where it leaves the carbon dioxide behind and picks up oxygen. Oxygenated blood then enters the left atrium and the left ventricle, before being pumped into the circulation again to deliver oxygen around the body.  Blood varies in color. Most times when you injure yourself or have blood drawn for tests or as a donation it is dark red blood. That’s because it is venous, or from a vein. It’s dark red because it has been depleted of oxygen and is on its way back to the heart and lungs to drop off carbon dioxide and pick up oxygen.

Why Dark Blood Test?

I have a slightly different answer then the others who (rightly) point out that it could be the difference between venous (from a vein) or arterial blood (from an artery).I am going to point out that some people have more red blood cells than others. One of the causes may be anemia.

Another may be hemodilution- maybe they received a large amount of IV fluid. Keep in mind I am not a doctor or a phlebotomist- this is merely my observations.
I only deal with blood of the deceased. In the first 2 pictures you will see blood that has been ‘spun down’ – put through a centrifuge- the serum is on the top, and the red blood cells are on the bottom. All of these sample were collected from the subclavian vein.

Both of the above samples are from the same decedent- you will note that even though the amount of fluid in the tube is slightly different- the dark portion at the bottom is proportional. The dark part at the bottom is the red blood cells.The tube on the left is from once decedent and the middle and right tube are from a second one. You can see the amount of red blood cells are significantly different. They one on the left has a large amount of red blood cells and I would presume would have a darker color when ‘bleeding’. The second one in this picture has more than the first example, but less than the one on the right.One of my tasks is to make DNA cards on blood sample that are mailed in from decedent’s that did not come into our office, but examined by appointed doctors.


These would mostly be collected from the femoral artery, but some may be subclavian. There are no examples of this below- but if we get someone in the early stages of decomposition, it will actually have a greenish-tint.You can see significant color difference in all of these samples. When I was first doing this, I thought that the lighter colors must be from people who died after getting significant IV fluid. But after a (very unscientific) search- I found there was no correlation.So my answer is that the darkness of your blood may be just a normal part of the spectrum of the color of the blood in humans.




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