Kidney failure?

My friend's back has been hurting really badly, and his urine is apparently 'thick like syrup' (wayyy to much information, but he doesn't have a yahoo account), he doesn't pee that much unless he's drinking liquid, and, yes, he is going to the doctors. But, what are some things he should ask the doctor/what could it possibly be?

Cloudy, murky, or turbid (muddy) urine is characteristic of a urinary tract infection, which may also have an offensive smell. Murky urine may also be caused by the presence of bacteria, mucus, white blood cells or red blood cells, epithelial cells, fat, or phosphates.

Dark brown or clear urine is characteristic of a liver disorder such as acute viral hepatitis or cirrhosis.

Pink, red, or smoky brown urine can be a side effect of a medication or may be caused by the recent consumption of beets, blackberries or certain food colorings. It is also characteristic of a urinary tract disorder in which bleeding occurs such as cystitis, enlarged prostate, kidney cancer, bladder tumor, tuberculosis, bladder stones, kidney infection, Wilms' tumor (in children), or hypernephroma. Hemolytic anemia and porphyria can also cause urine to take on these colors. It may also occur after trauma to the kidneys or urinary tract.

Dark yellow or orange urine can be caused by recent use of laxatives or consumption of B complex vitamins or carotene. Orange urine is often caused by pyridium (used in the treatment of urinary tract infections), rifampin, and warfarin.

Green or blue urine is due to the effect of artificial color in food or drug. It may also result from medications including amitriptyline, indomethacin, and doxorubicin.

Not just kidney disease can cause dark urine, but liver, pancreas and prostate also. Back pain is not usually related to renal failure, but to stones.

It sounds like he may have a kidney stone. Drinking liquids is what he needs to be doing. He needs to pass the stone and drinking a lot of fluid will help.

All you need to do go to doctor to take urine lab test, and to do drink water 5 time a day. It help your kidney stone pass it out.