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Hello Everyone, Need some guidance on validation of blood warmers. Recently our clinical engineering bought 24 new blood warmers, same model and brand of what we have already used and validated. We have just recently validated 6 of the 24 new ones with running blood through them and taking whole blood potassium levels at hourly intervals. The question we cannot agree on is do we need to validate every single blood warmer or is the 6 that we have done a sufficient sampling to be able to make a blanket statement that the warmers are ok for patient use. Anyone have any evidence based answers to this? At this point I'll take just some good advice! Thanks in advance.