Pediatrics Calculate the plasma osmolality if serum Na+ is 130, glucose is 180 mg/dl, & BUN is 56, K+ is 5, cl- is 117. A 260 B 270 C 280 D 290 💡 Explanation Calculate the plasma osmolality if serum Na+ is 130, glucose is 180 mg/dl, & BUN is 56, K+ is 5, cl- is 117. ✓ Correct Answer: D. 290