I have a 14mm renal calculus without hydnephrosis. is this something that can pass on its own?

Difficult to guess: Renal calculus, or kidney stones, are typically treated with regards to their size, location, composition, and complications. Any stone over 10 mm is considered large and unlikely to pass on its own. These stones are usually treated with an intervention by a Urologist to help safely remove the stone and avoid associated complications. The specific approach should be decided between you and your MD

14 mm stone: This size stone is a bit too large to pass on its own. It will cause pain and blockage eventually. This stone should be removed and analyzed. Then you require a metabolic work up on urine and blood to determine why you form stones and commence preventative therapy. Essential is that you drink 4 liters of fluid per day and reduce salt and animal protein intake.