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Medicine

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Endocrine

Question
10 out of 14
 

Calculate the plasma of osmolality of a patient whose RBS is 90 mg%, BUN 14mg%, Serum sodium is 135 meq/L and Potassium is 5 meq/L? (LQ)



A 290
B 280

C 374
D None of the above

Ans. A

290

Serum osmolality is calculated as follows: (Ref: Hari- 18th ed., pg-2977)

[2 x (serum Na + serum K) + plasma glucose (mg%)/18 + BUN (mg%) / 2.8)]

[2 X (135 + 5) + (90 / 18 + 14 / 2.8)]

= (2 X 140) + (5 + 5)

= 290

(Normal serum osmolality is 280 to 300 mosm/lit.)

Endocrine Flashcard List

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