My PCP Did A CCPeptide Test. The Results On The

My PCP did a CCPeptide test. The results on the paper showed as follows:
Normal Range <=5.0 U/ml and my result was 18.4
I am questioning the normal range. I saw on the Mayoclinic lab that the range would be <20 U/ml
I am thinking they confused the range with C-Peptide and not CC Peptide...
I am confused.