Im new to this whole kidney group, and knowing anything. Just would like a little insight. Im female, in my 30s. I recently discovered repeated lows in my gfr. Did some tests, got results but not much help from gp, waiting for Nephrologist appt. My urine osmoality is low, not serum. Potassium low, took supplements, got normal, stopped them then started falling again. Thinking diabetes insipidus, or something else, not diabetes. Ive taken Lithium 10+ years but my levels are always normal. Im just a little lost and worried, trying to do my research but exhausted. My bp started a high trend again so i just started on medication. I was on meds for high bp a few years ago as well. Dont drink or smoke, but have other health problems. Some autoimmune. Could anyone tell me more about osmoality?? Im a bit confused about having tests that dont make sense.