Hello and welcome to HCM,
Road traffic accidents cause profuse loss of blood.
The loss of blood in fracture
of femur is even more profuse since it isa very vascular compartment.
Repeated blood transfusions may be required, however, there is nothing to worry.
The healing of the fracture site requires formation of blood clot and thereafter callus
Dark colored urine is probably due to myoglobin
Crush injuries cause myoglobin from the muscles to be sequestered and is excreted in urine.
The excreted myoglobin in urine can be toxic to the kidney tubules.
levels are within normal limits indicating that kidneys are functioning normally and no damage has occurred.
Don't worry about fall in hemoglobin
Thanks and take care
Dr Shailja P Wahal