Answer:
a. Edema could be a sign of kidney failure. A urine sample might contain protein or urea.
Explanation:
Chronic Kidney Disease (CKD) is characterized by the progressive loss of the ability of the kidneys to filter blood, so that the patient may experience symptoms such as swelling in the feet and ankles, weakness and the appearance of foam in the urine, for example.
Therefore, it is important for these people to have regular urine and blood tests with creatinine levels to check if the kidneys are working properly and if there is a risk of developing.