Back to Top Why the Test Is Performed. This test can help determine if a patient has liver disease or kidney disease, or if the body is not absorbing enough protein. Albumin helps move many small molecules through the blood, including bilirubin, calcium, progesterone, and medications.ecreased blood albumin levels may occur when your body does not get or absorb enough nutrients, such as: 1  After weight-loss surgery. 2  Crohn's disease. 3  Low-protein diets. 4  Sprue. 5  Whipple's disease.
A negative number is a number $x$ such that $x+y=0$ for some positive number $y$. In other words, a negative number is an object whose sum with some positive number equals the additive identity. A similar approach can be used to define other mathematical objects: $ 1 x=0$ is an object such that $a+x=a$. $ 2 x=\frac{1}{a}$ is an object such that $xa=1$.
A common definition of negative is less than zero. In this sense, zero isn't negative (nor positive for a similar reason). But the opposite of zero is well defined: it is zero. The unary $+$ or $-$ operators can very well be applied to $0$, with no effect.