Chemistry Ch. 12,16.25,27 Test

Front 1

Given the following lab results, what is the most likely cause of this patient's BUN? BUN 45 mg/dL Creatinine 1.8 mg/dL Uric Acid 7 mg/dL pH 7.22 pC02 74.4 mm Hg p02 32.8 mm Hg 02 sat.51.3%

Back 1

congestive heart failure

Front 2

You just received a blood specimen from the emergency room. According to the requisition, the patient had overdosed on an antacid medication containing bromide salts. You have been asked to run a STAT set of electrolytes on the serum. Which electrolyte would most likely be falsely elevated?

Back 2

Chloride

Front 3

When blood is drawn into a Vacutainer tube and allowed to clot, if the serum is not separated from the cells, the serum potassium will tend to decrease and the serum sodium will tend to increase.

Back 3

False

Front 4

One cause for a DECREASED "anion gap" is:

Back 4

A decrease in albumin

Front 5

The membrane substance used in the potassium ion-selective electrode is:

Back 5

Valinomycin

Front 6

An electrolyte panel was performed on a patient in the emergency room. The following values were reported: Sodium: 150 mEq/L Potassium: 5 mEq/L Chloride: 110 mEq/L Bicarbonate: 30 mEq/L The anion gap (without using K) for this patient is:

Back 6

10 meq/L

Front 7

May Serum uric acid levels be elevated in patients undergoing cancer chemotherapy?

Back 7

True

Front 8

Describe the best and correct collection and handling conditions for a blood ammonia measurement.

Back 8

Draw heparin tube, keep on ice, separate cells from plasma, refrigerated centrifuge, freeze plasma if testing is delayed

Front 9

Describe everything about Urea:

Back 9

Synthesized from Co2 and ammonia

Front 10

A toxic condition involving a very high serum level of urea and accompanied by failure of the three main functions of the renal system is referred to as:

Back 10

Uremia

Front 11

Azotemia refers to:

Back 11

Abnormally high urea and blood

Front 12

The major causes of decreased plasma urea concentration include:

Back 12

Decreased protein and severe liver disease

Front 13

Is the main function of antidiuretic hormone to increase the reabsorption of sodium and increase the secretion of potassium?

Back 13

False

Front 14

The sweat test for chloride is used as a screening test for:

Back 14

Cystic fibrosis

Front 15

Which electrolyte(s) would be increased in the serum if the blood specimen was hemolyzed?

Back 15

Potassium and phosphate

Front 16

Does the enzymatic method for creatinine on the Vitros (Kodak Ektachem) analyzer use the reagent enzyme creatinine amidohydrolase?

Back 16

True

Front 17

Interferences with coupled colorimetric methods for uric acid in serum can be minimized by the preparation of:

Back 17

Potassium ferricyanide

Front 18

How can Urea be measured?

Back 18

Ph indicator. reference isotope dilution, mass spectrometry, color change, ammonium ions generated by something leading to a change

Front 19

Are serum urea levels less affected by diet and metabolism than are serum creatinine levels?

Back 19

False

Front 20

Does the enzymatic urea methods begin with the hydrolysis of urease?

Back 20

Yes

Front 21

A patient brought to the emergency room has the following laboratory results: sodium = 140 mmol/L glucose = 80 mg/dL BUN = 6.0 mg/dL osmolality = 316 mosm/Kg H20 The calculated osmolality on this patient using the Weisberg formula is:

Back 21

286

Front 22

A patient brought to the emergency room has the following laboratory results: sodium = 140 mmol/L glucose = 80 mg/dL BUN = 6.0 mg/dL osmolality = 316 mOsm/Kg H20 What does the "osmolal gap" suggest?

Back 22

Ethynol intoxication or other substances

Front 23

Hypernatremia commonly occurs in:

Back 23

Burns and excessive sweating without water intake

Front 24

Hyperkalemia occurs in:

Back 24

dehydration, primary indrenal, diabetes militates

Front 25

A low plasma osmolality and low sodium would be expected in a patient with:

Back 25

SLADH