Ond mae pryderon wedi'u codi am broblemau gyda rhai o'r darparwyr profion preifat, gan gynnwys hysbysebu prisiau anghywir a chamarweiniol, cyflwyno a phrosesu profion yn araf a chanlyniadau ddim yn llifo i systemau Cymru.
But concerns have been raised about issues with some of the private test providers, including inaccurate and misleading advertised prices, slow delivery and processing of tests and results not flowing into Welsh systems.