Urine analysis of patient suffering from heatstroke reveals:
Patients with exertional heatstroke (EHS), in contrast to those with CHS, are often young and previously healthy, and their diagnosis is usually more obvious from the history. Athletes, laborers, and military recruits are common victims. Unlike those with CHS, many EHS patients present profusely diaphoretic, despite significant dehydration. As a result of muscular exertion, rhabdomyolysis and acute renal failure are more common in EHS. Studies to detect rhabdomyolysis and its complications, including hypocalcemia and hyperphosphatemia, should be considered. Hyponatremia, hypoglycemia and coagulopathies are frequent findings. Elevated creatine kinase and lactate dehydrogenase levels also suggest EHS. Oliguria is a common finding. Renal failure can result from direct thermal injury, untreated rhabdomyolysis or volume depletion. Common urinalysis findings include microscopic hematuria, myoglobinuria, and granular or red cell casts. 
 
Harrison Principles of Internal Medicient Ed 19 Pg 479e3
Isomorphic red cells
Red cell casts
Hemosiderin
Hyaline cast