When the creatinine level is lower in the urine test, it indicates people may have kidney problem. As the creatinine is mostly excreted by kidney function, and the damaged kidney function cannot excrete the creatinine out, which will cause the high creatinine level in blood and low creatinine level in urine.
Then, you will not damage anything if timing belt breaks. You simply need to pay for a new one to be put on. Also, the timing belt should last 105,000 miles.       Other symptoms may include engine vibration sometimes bad enough to set a knock sensor code.
Timing belts break most often at start up and shut down of the engine, because that is often when the most tension is on the belt. If you have a non-interference engine, a broken belt is not really a big deal. You throw a new timing belt kit on it and keep driving. However, if you have an interference engine, internal engine damage is nearly inevitable, though the amount of damage varies depending on engine speed at the time of failure.