Mae Cymru yn cymryd rhan yn Astudiaeth y DU o COVID-19 ar ôl gadael yr ysbyty (UK Post-Hospitalisation COVID-19 Study) a ariennir gan y Sefydliad Cenedlaethol dros Ymchwil Iechyd (NIHR) ac Ymchwil ac Arloesi’r DU, y Cyngor Ymchwil Feddygol. Mae’r astudiaeth flaenllaw hon wedi cael ei sefydlu i asesu effeithiau hirdymor COVID-19 ar iechyd ac adferiad mewn 10,000 o gleifion, gyda’r nod o helpu i ddatblygu llwybrau gofal er mwyn helpu cleifion i wella cymaint â phosibl ar ôl cael y clefyd.
Wales is participating in the UK Post-Hospitalisation COVID-19 Study (PHOSP-COVID), funded by the National Institute for Health Research (NIHR) and MRC UK Research and Innovation.  This world leading study has been established to assess the long-term effects of COVID-19 on patient health and recovery in 10,000 participants with the aim of informing the development of care pathways to help patients recover as fully as possible after having experienced the disease.