NCLEX RN Practice Question # 929
NCLEX Examination.
Practice Question # 929.
nclex examination
Blood Urea Nitrogen (BUN), Uric Acid, Osmolality, Cystatin C Lab tests:
These tests are performed to measure kidney function, diagnose renal failure and kidney disease, and aid in kidney dialysis management.
Indications
- Measure BUN as an index of renal function, the production and excretion of urea, and creatinine level. BUN should be checked in patients who are confused, disoriented, or convulsing.
- Check uric acid levels to evaluate gout, renal failure, and the treatment of leukemia.
- Assess urine osmolality to evaluate its concentration, hydration, SIADH, and diabetes insipidus.
- Measure blood serum osmolality for toxic alcohol ingestion and to evaluate coma.
- Measure serum cystatin C (low-molecular-weight proteinase inhibitor) to assess glomerular filtration in the elderly.
- Note that creatinine clearance is usually performed with other tests of kidney function.
Reference Va l u e s Normal
BUN
Adults: 7–18 mg/dL or 2.5–6.4 mmol/L