Is there any external auditing of companies that perform blood tests?

I just had some routine blood testing ordered by my doctor. The results that came back were just too good to be true. In every measurement there was supposedly a huge improvement. I think the lab mixed up my results with someone else.

If there is no outside auditing, the only way of checking the validity is by checking tests for reasonableness. Based on a patient’s overall health, demographics and previous results, doctors can make an estimate of what results should come back.

I think the labs should be forced to do a retest at no additional cost if the results from one year differ by a certain amount from the previous year.