Urine Osmolality - Isosthenuria, Hyposthenuria and Hypersthenuria -

Description

Normally the renal tubules influence the glomerular filtrate as it becomes urine. Disorders of renal tubular function may affect the osmolality of the urine. In isosthenuria the renal tubules are not functioning properly and do little to alter the glomerular filtrate.

Parameters:

(1) urine osmolality in mOsm per kg water

(2) plasma osmolality in mOsm per kg water

ratio of urine to plasma osmolality =

= (urine osmolality) / (plasma osmolality)

Term	Urine Osmolality	Urine to Plasma Osmolality Ratio	Example Urine Osmolality
isosthenuria	similar to plasma	0.9 to 1.05	235 to 330
hyposthenuria	more dilute than plasma	< 0.9
hypersthenuria	more concentrated than plasma	> 1.1

The specific gravity of isosthenuric urine is often around 1.008 to 1.010 but may be affected by a number of factors.

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Description

Specialty

Objective

ICD-10

Urine Osmolality - Isosthenuria, Hyposthenuria and Hypersthenuria

Purpose: To evaluate urine and plasma osmolality as a measure of renal function.

Description

Specialty

Objective

ICD-10