If your vet can supply you with Sub-Q fluids and show you how to inject them and the frequency this has been the one thing I have learned that can bring a bird out of renal failure.
This is something I saved from past postings, and the info has saved several past birds...
------------------------------------------------------------
They CAN be treated sucessfully and live a long healthy life.
Renal problems are not exclusive to diet or genetics. A simple accident where the tiel get wedged somewhere with the wings up...even for a couple of minutes can cause a chill to the kidneys...thus crystalization of the urates, and if not caught soon enough and the bird Sub-Q hydrated it can go into renal failure and die. Quick action of Sub-Q therapy can actually reverse the renal failure and save a bird. Clipped birds that have a draft going upwards can also suffer the same fate. Over the years I lost several birds this way (verified by necropsy's)
Excess protein in the diet can contribute to to renal problems and failure. A breeder friend of mine added powdered protein to her handfeeding formula to beef up her babies. Within 24 hours 11 out of 12 babies went into renal failure.
Pesticides or toxins can cause renal failure.
Typical indications of renal problems: The bird acts lethagic. The muscles feel bunched and tight. The eyes are slitted from excruciating pain. There is either blood (pinkish discoloration) in the urine, or the urates will be thin, gritty, and chalky looking.
Initial treatment would be a medication called allopurinol. Usually you will see a dramatic improvement with the bird within a day. Other helpful things are adding a small amount of cranberry or cherry juice to the drinking water. This helps to break down some of the crystals formed from the uric acid. Hulled oats (oat groats) helps to reduce uric acid levels. Celery greens and seeds are good for renal problems and act as an antiseptic to disinfect the urinary tubules. The silk from ear corn (organically grown or a herbal extract) will sooth the damaged urinary tract, and improve urine flow. Plus corn silk is a source of potassium, Vitamin C and K. Plain grass, roots and all (no joke, cats/dogs will eat this if they have urinary problems) will benefit both the liver and kidneys. Dandilion greens helps with the liver, but it also aids the kidneys by stimulating them to remove toxins in the urine. Coconut water (not the milk) will help with hydration and balancing the electrolytes in the body.
The above is a few simple things to help those with renal/kidney problems. I've personally used many of the above things to help the bird and not lose it.
Celery:
Celery is an excellent food that digests well with almost anything else. It contains the necessary mineral sodium, which is present in a ratio that can be easily accessed by the body. Sodium is critical, along with the mineral potassium, in managing the body's electrolyte balance.
Electrolytes create electric osmotic pressure which helps the body to move fluids through the cell's membranes. It can be eaten with any other fruit or vegetable.