Pediatrics General b5eab999 The normal concentration of protein in CSF at 4 weeks may be as high as- A 500mg % B 125mg% C 50mg% D 25mg% High-Yield Explanation Ans. is 'd' i.e., 25 mg% It is 15-40 mg%. Protein content in CSF Age 63 mg% Premature 73 mg% Day 1 47 mg% Day 7 15-40 mg% After 7 days