NPNs - Clinical Chemistry 1

It serves as the reabsorption site of the majority of NPNs in the plasma.

• Loop of Henle

• Distal convoluted tubule

• Proximal convoluted tubule

• Collecting duct

Color produced after addition of Nessler's reagent to measure the concentration of NPN compounds.

• Blue

• Green

• Yellow to brown

• Red

Major NPN compound in the plasma and is first to elevate in kidney diseases.

• Creatinine

• Uric acid

• Urea

• Ammonia

Site of synthesis of NPNs.

• Kidney

• Liver

• Pancreas

• Spleen

What can be computed or evaluated by the attending physician to verify the adequacy of dialysis using pre- and post-dialysis samples?

• Uric acid ratio

• Urea/Creatinine ratio

• Urea reduction ratio (URR)

• Glomerular filtration rate (GFR)

Proposed reference method for urea determination.

• Berthelot reaction

• Nesslerization

• Isotope dilution mass spectrometry

• Enzymatic urease method

On the enzymatic assay for urea, what is the enzyme used along with urease to measure reduction of NADH?

• Glutamate oxidase

• Lactate dehydrogenase

• Glutamate dehydrogenase (GLDH)

Conversion factor used to convert BUN to Urea.

• 0.166

• 0.357

• 2.14

• 6.25

Conversion factor of BUN concentration from conventional to SI equivalent.

• 0.714

• 0.357

• 1.2

• 2.14

Term that denotes elevated BUN concentration.

• Azotemia

• Uremia

• Hyperuremia

• Ammonemia