How were your actual BUN and creatinine on there own? If each one on there own were normal then you dont' have to worry. Most labs nowadays, dont' even run the ratio if each individual one is normal. Sometimes if one of them is on the top end and the other one is on the low end, you will end up with a high ratio but it doesn't really mean anything if they are both normal. If one or both of them are high, then you need to check it out. A high BUN usually means you aren't drinking enough. A high creatinine is related to your kidney function. A low creatinine is usually just due to a high protein diet.
How much calcium are you taking and is it calcium citrate? A calcium level that high usually means you are leaking calcium from your bones either from not enough calcium or the wrong type of calcium. If you are taking calcium carbonate, then you need to switch to calcium citrate. You also need to have a PTH to go with the high calcium level to see what is going on. In very rare instances, a high calcium and a high PTH can mean hyperparathyroidism and further testing needs to be done. I would recommend seeing an Endocrinologist about your high calcium levels if it continues.
At 6 months out, you should be getting a full set of labs. Here is a list of what you should be getting at all lab draws. Wether it is your surgeon or your PCP.
CBC, Comprehesive Metabolic Panel, Iron, TIBC, Iron Sat %, Ferritin, B12, Folate, Vitamin D ( 25 Hydroxy), Phosporus, Calcium, PTH, Vitamin A, Vitamin E, Vitamin K, Lipid Panel, Zinc, Magnesium, Selenium, Copper, Vitamin B1 (Whole Blood), B6, TSH and T3, HemA1C