Nonprotein Nitrogen

Question 1

Which nonprotein nitrogen fraction constitutes nearly half of the npn substances in the blood

Answer 1

Urea

Question 2

Prerenal hyperuricemia is caused by

Answer 2

Congenital heart failure

Question 3

A technologist obtain Zebulon value of 61 mg per deciliter and serum creatinine value of 3.1 mg per deciliter on a patient. These results indicate

Answer 3

Renal failure. Elevated BUN and creatinine

Question 4

A BUN of 9 mg per deciliter is obtained by a technologist. What is the urea concentration. B UN x 2.14 = urea

Answer 4

19.3 mg/dl

Question 5

Creatinine clearance is used to estimate the

Answer 5

Glomerular filtration rate

Question 6

But Jeffe reaction is the basis for method involving the quantitation of

Answer 6

Creatinine

Question 7

Creatinine is formed from the catabolism of

Answer 7

Creatine

Question 8

In the jaffe reaction, a red orange chromogen is formed when creatinine reacts with

Answer 8

Picric acid

Question 9

In the Jaffe method two compounds give a positive interference in kinetic creatinine measurement they are

Answer 9

Pyruvate and acetoacetate

Question 10

Substances known to increase results when measuring creatinine by the Jaffe reaction include all of the following

Answer 10

Glucose, Alpha keto acids, ascorbate

Question 11

What represents the end product of purine metabolism in humans

Answer 11

Uric acid

Question 12

A patient with glomerulonephritis would present the following serum results

Answer 12

Increased bun

Question 13

A person cannot have a low creatinine clearance and a normal serum creatinine level

Answer 13

True

Question 14

Ammonia is coupled with what molecule in the liver to create urea

Answer 14

CO2

Question 15

Increase in the plasma concentration of urea

Answer 15

Azotemia

Question 16

Increase in urea due to pathophysiologic processes that are not directly related to the kidney

Answer 16

Prerenal azotemia

Question 17

Increased in urea caused by lesions in the kidney

Answer 17

Renal azotemia

Question 18

Increase in urea in the blood are secondary to pathophysiologic processes that also affect the glomerular filtration rate but are not directly related to lesions in the kidney

Answer 18

Post renal azotemia

Question 19

Clinical syndrome occurring with prolonged azotemia

Answer 19

Uremia

Question 20

Monosodium urate crystals will produce what color polarization on X & Y axis

Answer 20

Yellow on x axis and blue on y axis

Question 21

What is associated with elevated plasma uric acid concentrations

Answer 21

Gout, renal disease, leach nyhand syndrome

Question 22

Increased hydrostatic pressure, decrease oncotic pressure

Answer 22

Transudate

Question 23

Increased capillary permeability, decrease lymphatic absorption

Answer 23

Exudate

Question 24

Low protein, low enzyme content, low cholesterol ratio, low LD ratio, less than 50% total protein, clear, pale yellow

Answer 24

Transudate

Question 25

Cloudy, variable color, increased bilirubin, glucose is less than or equal to serum level, total proteins above 50%, LD ratios elevated, cholesterol is increased, hi enzyme content, high protein more than 4%

Answer 25

Exudate

Question 26

A technologist obtains a urea N value of 61 and serum creatinine value of 2.5 which are both elevated results these results indicate

Answer 26

Urinary tract obstruction

Question 27

Uric acid is the final product of

Answer 27

Purine metabolism

Question 28

Ammonia concentrations are usually measured to evaluate

Answer 28

Hepatic encephalopathy

Question 29

When calculating creatinine clearance using the mdrd equation, which of the following factors are considered

Answer 29

Body mass

Question 30

Serum creatinine levels may be falsely elevated when a patient is taking cephalosporin

Answer 30

True

Question 31

When measuring ammonia blood levels, which of the following might cause a false increase in the analyte

Answer 31

The patient had two cigarettes 15 minutes prior to blood draw

Question 32

A complete deficiency of hypoxanthine guanine phosphoribosyltransferase results in which disease

Answer 32

Lesch Nyhan syndrome