Hello
Lower
back pain may be due to many reasons like musculoskeletal causes,pelvic pathology,genitourinary causes etc.
Kidney stones may cause pain,infection,hematuria(blood in urine)etc.
You are rightly advised for
ultrasound and urine culture and sensitivity.
You need proper clinical examination and routine investigations.
Investigations include routine hemogram,renal function test,urine RE/ME,ultrasound of abdomen.
Ultrasound of abdomen is important in diagnosis and treatment.It can exclude many causes.
It is important to exclude
urinary tract infection(UTI)in your case.
Proper treatment depend upon findings.
You should drink plenty of water.
Get well soon.
Take Care
Dr.Indu Bhushan