The first guidance issued on 23 March 2020, when health boards were under most strain, advised health boards to prioritise providing contacts at 10 to 14 days, 6 to 8 weeks and 6 months.
Cyrhaeddwyd yr uchafbwyntiau uchaf ar gofnod o 14.3 wythnos ar gyfer diagnosteg a 14.9 wythnos ar gyfer therapïau ym mis Mehefin 2020.