Clinical Chemistry: Electrolytes

  1. A plasma specimen from a hospital patient is analyzed on an osmometer and reported as 400 mOsm/Kg. What is the most likely effect on this patient's water distribution in the tissues?
  2. True or False?
    Choloride is the major extracellular anion in plasma.
  3. True or False?
    The main function of antidiuretic hormone is to increase the reabsorption of sodium and increase the secretion of potassium.
  4. The sweat test for chloride is used as a screening test for:
    Cystic fibrosis
  5. Which of the following electrolytes would be increased in the serum if the blood specimen was hemolyzed?
    Potassium and phosphate
  6. When a mole of NaCl is added to a kilogram of water, which of the following changes occurs in its colligative properties?
    The osmotic pressure is increased and the freezing point is decreased
  7. 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 Osmolity= 316 mOsm/Kg H20
    The calculated osmolity on this patient using the Weisburg formula is:
  8. 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 Osmolity= 316 mOsm/Kg H20
    True or False?
    The "Osmolal gap" suggests that this patient could be suffering from ethanol intoxication or ingestion of some other volatile substance:
  9. 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?
  10. True or False?
    Blood is drawn into a Vacutainer tube and allowed to clot. If the serum is not seperated from the cells, the serum potasssium will tend to decrease and the serum sodium will tend to increase.
  11. One cause for a DECREASED "anion gap" is:
    A decrease in albumin
  12. The membrane substance used in the potassium ion-selective electrode is:
  13. 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 meg/L Bicarbonate: 30 meq/L
    The anion gap (without using K) for this patient is:
  14. Hypernatremia commonly occurs in:
    Burns and excessive sweating without water intake
  15. Hyperkalemia may be seen in all the following EXCEPT:
    Diuretic therapy only
  16. One notable exception where hypochloremia does not mimic hyponatremia is:
  17. A low plasma osmolity and low sodium would be expected in a patient with:
  18. What is the purpose of the hydroxyquinoline in the cresolpthalen determination for calcium?
    Reduce Mg interference
  19. The combination of non-fasting and hemolyzed serum from a patient for phosphorus determination could possibly cause results to be:
  20. Which of the following enzyme tests is most affected by "hemolysis"?
    Lactate dehydrogenase
  21. One International Unit is defined as one __________ of substrate converted to product per ____________.
    Micromole; minute
  22. Which of the following is NOT considered a coenzyme?
  23. Which of the following enzymes requires chloride (Cl) as an activator?
  24. The enzyme that is inhibited by hemoglobin is:
  25. Prostatic acid phosphatase measurement has been replaced by:
  26. Of the following, the only clinically analyzed enzyme in the urine is:
  27. In the Szasz method for gamma glutamyl transferase (GGT), the typical receptor molecule is:
    Glycyl glycine
  28. A reaction rate assay measures enzyme __________; an endpoint assay measures enzyme _____________.
    Activity; activity
  29. The method of choice for measurement of serum ionized calcium is:
    Ionselective electrode
Card Set
Clinical Chemistry: Electrolytes
Clinical Chemistry: Electrolytes