All issues > Volume 31(5); 1988

Original Article

J Korean Pediatr Soc. 1988;31(5):555-558. Published online May 31, 1988.

The Relationship of Specific Gravity by Refractometer and Osmolality in the Urine of Neonates.

Hae Young Lee¹, In Soon Ahn¹, Jae Seung Yang¹, Beak Keun Lim¹, Jong Soo Kim¹

¹Department of Pediatrics, Wonju College of Medicine, Yonsei University, Wonju, Klorea

Received: November 4, 1988;  Accepted: December 31, 1988.

Abstract

Comparison of urinary specific gravity by refractometer and osmolality in 238 neonates demonstrated as followings; 1) The regression line is represented by the equation: Y = 107+14.2 (X-1000) while Y = osmolality in mosm/kg X = Specific gravity by refractometer r=0.8545 2) Osmolality is the only accurate measure of urine concentration in newborn infants. If the specific gravity by refractometer is used to screen for urine concentration, an elevated level should be checked by measuring the osmolality.

Keywords :Specific gravity, Osmolality, Urine, Neonates