Why does urine normally not contain proteins and carbohydrates?

Answer 1

Normally, protein is not found in urine. This is because the kidney is supposed to keep large molecules, like protein, in the blood and only filter out smaller impurities. Even if small amounts of protein do get through, they are normally reabsorbed by the body and used as a source of energy.

Some proteins will appear in the urine if the levels of protein in blood become high, even when the kidney is functioning properly.

If the kidney is diseased, protein will appear in the urine even if blood levels are normal.

Answer 2

There should only be trace amounts of urine in your protein. 0 to 8 mg/mL is the normal amount for a random sample and less than 150 mg per 24 hours. If you have more than that it could be indicative of a medical problem and you should see your doctor. My doctor told me that more than the normal amount of protein is found in my urine sample. What is your advice?

Answer 3

I believe that carbohydrates and proteins which are large molecules can not readily pass through the glomerulus (filtering part of nephron) and become part of urine. Glucose, amino acids, water, urea which are comparatively small can. Glucose, amino acids and water are normally reabsorbed by the kidneys.

Answer 4

there are three layers that separate fluid in glomerular capillaries from fluid in bowman's capsule that is the endothelial cell,basement membrane and podocytes cell. besides that, there is a layer of polyanionic

glycoproteins that covers the surface of the components of the filtration barrier repels large

anions (i.e. proteins with a net negative charge like albumin). The layer of polyanionic glycoprotein is negatively charged, so it propel the protein albumin which is also negatively charged

Answer 5

im not even sure what you're asking. "protein" shouldn't be in urine, and although not necessarily pathologic, it may warrant further testing.

Proteins are not found in the urine because the particles are too big to be filtered.

Answer 6

Blood passes through the kidneys, and the kidneys filter waste products out of the blood to be passed into urine. A healthy kidney will block proteins from passing through into urine, & so the proteins will continue to circulate back into blood after reaching the kidneys.

Answer 7

Because you're looking for protein in your urine.

Answer 8

Kidneys filter out the protein.

Prescence of protein means that filters are not working and give an indication for a diseased kidney.

Answer 9

because PENIS