The concentration of a drug or chemical in urine is affected by how dilute or concentrated the urine is. One way of standardizing a test result is to adjust the value to a standard urine specific gravity.
Reference specific gravity: 1.024
Specimen selection:
(1) urines with a specific gravity < 1.010 may be rejected as too dilute.
(2) urines with a specific gravity > 1.030 may be rejected as too concentrated.
Parameters:
(1) concentration in the urine in mg/dL
(2) specific gravity of the urine sample
adjusted urine concentration =
= (measured urine concentration) * X
X =
= (1.024 - 1) / ((measured specific gravity) - 1)
To read more or access our algorithms and calculators, please log in or register.
