Urea is one of the principal products of the breakdown of body proteins and is excreted by the kidneys into the urine. Raised urea levels are associated with renal failure, dehydration, chronic cardiac failure and haematemesis. Low levels are associated with pregnancy and people on a low protein diet.
Serum: 2.5 – 7.0 mmol/L
Urine: 165 – 583 mmol/24hours
- Serum or Plasma treated with Lithium Heparin.
- Random urine or 24 hour urine specimen in a plain bottle.
- Three patient identifiers from
- NHS number
- Unit number