there are areas to be avoided due to the possibility of decreased blood flow, infection, hemolysis, or sample contamination.
Sample contamination affects the integrity of the specimen causing invalid test results
Incorrect blood collection techniques that cause contamination include blood collected from edematous areas, blood collected from veins with hematomas, blood collected from arms containing an IV, sites contaminated with alcohol or iodine, or anticoagulant carryover between tubes.
