Varies: Worst case of incompatible blood is major txfsn reaction w/fever back pain red urine jaundice shock and kidney failure. Minor incompatibility can cause delayed reaction with drop in blood count about 7 days later w/o other symptoms. Fever only reactions are common and harmless. Allergic reactions with hives, sometimes low BP can occur. Only the major reaction is checked for and shouldn't happen
Answered 2/8/2017
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