what does it mean when you can't get blood from a vein?
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Dehydration, loss of vein patency, and low blood pressure are typical issues, while arthritis, injury, or stroke may give elderly patients a limited range of motion, making it impossible to hyperextend their arms to survey for available veins. “The biggest problem is fragile, delicate veins that blow.
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The arteries in the legs are most often affected, which may impair circulation to your feet, causing them to feel cold. Also referred to as venous disease, vein disease refers to various issues that affect blood flow through your veins, including varicose veins and deep vein thrombosis (DVT).
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Venous insufficiency is a medical condition in which veins in the body (most often in the legs) are not able to pump blood back to the heart. This causes blood to pool in the blood vessels so that they become enlarged (varicose) or dilated over time.
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You may have a few minutes of discomfort during or after the test. Collecting blood from an artery typically hurts more than drawing it from a vein. Arteries are deeper than veins, and there are sensitive nerves nearby. You also may feel lightheaded, faint, dizzy, or nauseated while your blood is drawn.
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In the legs, spider veins can occur when the valves inside the veins stop working properly. Veins carry blood back to the heart. To prevent blood from flowing backward, they contain a one-way valve that closes once the blood passes through it.
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These venous problems lead to pooling of the blood in the legs or obstructed veins. Without proper blood flow in these areas, extra fluid can begin to build in the tissue. This pressure can cause puffiness in one leg or both, often restricting the range of motion in the ankles and feet.
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['being female.', 'having a close family member with varicose veins.', 'older age.', 'being overweight.', 'having a job that involves long periods of standing.', 'being pregnant.', 'other conditions.']
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If the venipuncture proves difficult because of a hard-to-find vein, pre-warming the antecubital area or rotating the wrist might help distend the vein and make it easier to find. If dehydration might be the cause, sometimes phlebotomists can ask the patient to drink water and return later to do the draw.
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Varicose veins are usually caused by weak vein walls and valves. Inside your veins are tiny one-way valves that open to let the blood through, and then close to prevent it flowing backwards. Sometimes the walls of the veins become stretched and lose their elasticity, causing the valves to weaken.
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Chronic venous insufficiency is also called "venous reflux". Venous reflux occurs when venous valves don't function adequately, leading to reversal of blood flow through the valves during standing or sitting.
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Varicose veins can be more than just unsightly. They can cause pain, swelling, restless leg syndrome and tired, aching legs – symptoms that can directly affect daily activities and quality of life. Untreated varicose veins can be dangerous because the blood that is pooling in these veins can clot.
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Dehydration is a common problem for people anytime of the year. Your veins contain much of the fluids in your body, so if you haven't had much to drink the day of your draw, those little fluid filled vessels will not be as easy to access and are more likely to collapse flat when a needle is inserted.
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Tweet. Email. Poor circulation is when one or more parts of the body receive inadequate blood flow. Poor blood circulation, which will be experienced in people with peripheral arterial disease (PAD), can lead to a higher chance of developing serious foot problems.
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If you have chronic venous insufficiency (CVI), the valves don't work like they should and some of the blood may go back down into your legs. That causes blood to pool or collect in the veins. Over time, CVI can cause pain, swelling, and skin changes in your legs.
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Most of the time, the cause is simple. It may happen if you've lain on your arm or otherwise put pressure on it. This prevents the blood from flowing correctly to your nerves. Poor positioning may also lead to pressure being placed directly on a nerve.
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Cold feet or legs: Reduced blood flow in your feet causes them to feel colder than other parts of your body. Swollen legs, ankles, or feet: When your veins can't push blood upward, it can collect in your legs. This blood pooling puts extra pressure on the area, causing fluid buildup and swelling.
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Venous Diseases Vein diseases like deep vein thrombosis or DVT, and even varicose veins, can cause tingling in the legs. This is because venous disease disrupts the normal flow of blood throughout the body and can lead to blood clots, which can cut off the blood supply to nerves.