Is the same CPT code used for both the “intact” PTH test and the CAP test?
Yes. There are many instances where several tests are performed on the same sample and only one CPT code is available for billing for the different tests. Some examples are: PSA and free PSA (for calculation of PSA ratio); HDL and cholesterol (for calculation of the LDL/HDL ratio); toxo IgM and toxo IgG; dander IgE and ragweed IgE, etc.