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A member asked:
Vein collapse during blood work? why does this happen?
5 doctors weighed in across 2 answers
Spasm: Several reasons: adrenaline from anxiety spasm from contact with needle bad technique. Just missed!
Answered 12/31/2013
4.6k views
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Stress: Anxiety, anticipation of pain with needle sticks will energize the sympathetic nervous system, causing vasospasm (shrinking) of veins. Try hydration prior blood work, placing warm heating pad on arm for better success.
Answered 1/6/2014
4.6k views
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