A laboratory may elect to participate in PT studies more frequently than required by the semiannual schedule. Additional studies are not distinguished from the routinely scheduled studies. They are counted and scored the same way and must be at least seven (7) calendar days apart from the date of analysis.

Added at 28 Ok Reg 1201, eff 7-1-11

Amended at 39 Ok Reg 1065, eff 9-15-22