Your 17 year old patient presents following a syncopal episode. His pulse and blood pressure reflect orthostasis with a change in pulse by 40 points from lying to standing. Based on his weight chart, he is down 15 pounds from his last visit 2 months ago. He is complaining of a change in the color of his urine to a dark brown like ‘dirty ice tea’ but denies dysuria and ever being sexually active. Of note, he has been working to meet a lower weight class for a wrestling competition. What diagnosis should be at the top of your list in considering the above information? Group of answer choices Chronic Renal Insufficiency Rhabdomyolysis Nephrolithiasis Pyelonephritis