How significant is this abdominal ultrasound : left kidney: two punctate echogenic foci in the cortex of the mid pole and left lower pole, without definite posterior acoustic shadowing, indeterminate. could it be cancer.? elevated creatinine?

All findings must be placed in the proper clinical context - you should discuss these findings with the doctor who ordered the test for you. What was the reason for the abdominal ultrasound? An elevated creatinine can have multiple causes ranging from dehydration to large muscle mass to renal failure. This can be nothing or it can be something. See your doctors who ordered the testing.