Giving blood without the rubber?

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If the rubber tourniquet is not tied while the needle is in the arm, the blood flow may experience a slight reduction. The tourniquet compresses the veins, allowing them to expand and become more visible for easier needle insertion. Once the needle is in, the tourniquet can often be removed with minimal impact on blood collection. The primary function of the tourniquet is to temporarily halt blood flow back to the heart, which helps in locating the vein. Overall, not using the tourniquet can complicate the process of drawing blood effectively.
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What would happen if you didnt tie that rubber while the needle is in your arm gathering blood. Would it spray a lot faster or not at all?
 
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The rubber compresses the veins making the part before the rubber expand a bit and become easier to see.
This makes it easier to poke the needle into the vein without missing and without going completely through the vein(not a good thing).

After the needle is in the rubber can be removed with little effect and often is.
There will be a slight reduction in flow.
 
Well, it's not so much that it compresses the vein, it's that it stops the flow (veins carry blood BACK to the heart), causing the vein to plump up. But yeah, what he said.
 

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