Some results are classed as indeterminate, which means that the laboratory could not obtain a valid result from the swab sample and so were unable to determine whether SARS-CoV-2 virus was present.
Caiff rhai canlyniadau eu dosbarthu yn rhai amhendant, sy'n golygu na allai'r labordy gael canlyniad dilys o'r sampl swab ac felly nad oedd yn bosibl nodi a oedd SARS-CoV-2 yn bresennol.