With kidney function 17 percent and phosphorour is 4.9 there a concern?

Yes.

Kidney function is measured using a variety of tests, but one of the most important is the glomerular filtration rate (GFR). The GFR is a measure of how well the kidneys are able to filter waste products from the blood.

A normal GFR is between 90 and 120 milliliters per minute. When GFR drops below 60, it is considered to be chronic kidney disease (CKD). CKD stage 5 is the most severe form of CKD and is characterized by GFR below 15.

Phosphorus is a mineral that is found in many foods, including dairy products, meat, legumes, and nuts. When the kidneys are not functioning properly, phosphorus can build up in the blood. High phosphorus levels can cause a number of problems, including bone pain, muscle weakness, and vascular calcification.

In the case described above, the kidney function is 17 percent and phosphorus is 4.9. This means that GFR is approximately 19 milliliters per minute, and that the person has CKD stage 5. This is a very serious condition and requires close medical attention.

Treatment for CKD stage 5 typically involves dialysis, which is a procedure that removes waste products from the blood. Dialysis can be performed in a hospital or at home.

In addition to dialysis, people with CKD stage 5 may also need to make changes to their diet, such as reducing phosphorus and protein intake. They may also need to take medications to control blood pressure, anemia, and other complications of CKD.

CKD stage 5 is a serious condition, but with careful management, people with this condition can live full and active lives.