Well, despite the MCH and MCV, your magic number is XXXXX Hct (hematocrit). If that number is XXXXX within range, then he is not anemic (low blood count). With advancing kidney disease, and less production of erythropoietein from the kidneys, that Hct will drop.
The WBC is okay.
Platelets can be a bit lower when their is "clumping" in the blood. That can be a very normal artifact, if it is there. Otherwise, a platelet count around the normal range is okay.
The hair thinning is difficult to assess. What you really need to find out is if the blood test included a thyroid level. Next to kidney disease, the most common condition we run into is hyperthyroid (elevated thyroid hormone), and it definitely could cause that change.
The elevation in the kidney disease is important. If the BUN is already over 80-100 or the creatinine is 2-3x above it's normal range, that would be indicative of more serious kidney disease.
Additional therapy that can be given to help the kidneys is regular fluid administration underneath the skin at home. However, your vet will know when that is and is not needed.
Great that he is eating and drinking well. So, nothing I can evaluate with only a blood test that would indicate he is dying right this moment. However, I can't attest to the degree of kidney disease. That is up to your vet.
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thyroid would be T4, T3, TSH.....
Everything else looks stable. ALT is fine.
Unfortunately, without my own examination to evaluate overall health, there is no way for me to predict. In general, in older cats that have elevated kidney values it is an indication of a chronic problem, and there would not be a 100% recovery.
Liver enzymes are okay.
With a kidney problem, you should feed a prescription diet with "restricted" protein and lower phosphorous like Science Diet K/D or Royal Canin Renal LP