Welcome to HCM!
Most common complication of blood sample collection from antecubital fossa in elbow is hematoma
formation where vein is pricked and the blood leaks out leading painful discolaration in elbow area.are you having blue discolration around elbow region.sharp pain
during blood collection is when a nerve is touched.nerve injuries present as pain tingling
but these injuries are usually transient and subside in 7-10 days!hope this satisfies your query!