The number of tests authorised in NHS Wales laboratories had been on the rise until the start of June where there was a fall before a small increase over the last few days.
Mae nifer y profion a awdurdodwyd yn labordai GIG Cymru wedi bod ar gynnydd tan ddechrau mis Mehefin lle bu cwymp cyn cynnydd bach dros yr ychydig ddyddiau diwethaf.