O ganlyniad i'r ymchwiliadau hyn, mae gwasanaeth Profi ac Olrhain GIG y DU wedi atal gweithrediadau profi a ddarperir gan labordy yn Lloegr ond mae'n effeithio ar rai trigolion yng Nghymru. Mae hyn yn ymwneud â materion technegol yn y labordy sydd wedi arwain at roi canlyniadau anghywir i rai pobl rhwng 8 Medi a 12 Hydref.  Rydym wedi cael gwybod bod y mater hwn wedi'i ynysu i'r labordy hwn ac nid yw'n cynnwys y rhwydwaith ehangach, gan gynnwys labordy IP5 yng Nghasnewydd sy'n prosesu'r rhan fwyaf o samplau o Gymru.
As a result of these investigations UK NHS Tests and Trace has suspended testing operations provided by a laboratory in England but affects some residents in Wales. This involves technical issues at the laboratory that has led to some people being given incorrect results between 8 September and 12 October.  We have been informed this issue is isolated to this laboratory and does not involve the wider network including the IP5 laboratory in Newport that processes the majority of Welsh samples.