BOC CHEMISTRY Exam Questions with 100%
Correct Answers| Verified Solutions Latest
2024/2025 u pdate
A blood gas sample was sent to the lab on ice, and a bubble was present in the syringe.
The blood had been exposed to room air for atleast 30 minutes. The following change in
blood gases will occur"
C02 content increased/PC02 decreased
P02 increased/ HC03 decreased
C02 content and PC02 increased/ pH increased
C02 content and PC02 decreased/pH decreased - ✔✔P02 Increased/ HC03 decreased
The following laboratory results were obtained:
Serum electrolytes
sodium: 136 mEq/L (136 mmol/L)
potassium: 4.4 mEq/L (4.4 mmol/L)
chloride: 92 mEq/L (92 mmol/L)
bicarbonate: 40 mEq/L (40 mmol/L)
Arterial blood
pH: 7.32
PCO2: 79 mm Hg
These results are most compatible with:
respiratory alkalosis
respiratory acidosis
,metabolic alkalosis
metabolic acidosis - ✔✔respiratory acidosis
Select the test which evaluates renal tubular function
osmolarity
IVP
creatinine clearance
osmolarity
microscopic urinalysis - ✔✔osmolarity
A patient had the following serum results:
Na+: 140 mEq/L (140 mmol/L)
K+: 4.0 mEq/L (4.0 mmol/L)
glucose: 95 mg/dL (5.2 mmol/L)
BUN: 10 mg/dL (3.57 mmol/L)
Which osmolality is consistent with these results?
188
204
270
390 - ✔✔204
What battery of tests is most useful in evaluating an anion gap of 22 mEq/L (22
mmol/L)?
Ca++, Mg++, PCT4 and pH
,AST, ALT, LD and amylase
glucose, CK, myoglobin and cryoglobulin
BUN, creatinine, salicylate and methanol - ✔✔BUN, creatinine, salicylate and
methanol
A patient with myeloproliferative disorder has the following values
Hgb: 13 g/dL (130 mmol/L) Hct: 38%
WBC: 30 x 103/|JL (30 x 109/L) platelets: 1000 x 103/pL (1000 x 109/L) serum Na+: 140
mEq/L (140 mmol/L) serum K+: 7 mEq/L (7 mmol/L)
The serum K+ should be confirmed by:
testing heparinized plasma
repeat testing of the original serum
testing freshly drawn serum
atomic absorption spectrometry - ✔✔testing heparinized plasma
Serum "anion gap" is increased in patients with:
renal tubular acidosis
diabetic alkalosis
lactic acidosis
metabolic acidosis due to diarrhea - ✔✔lactic acidosis
The anion gap is useful for quality control of laboratory results for:
amino acids and proteins
blood gas analyses
calcium, phosphorus and magnesium
, sodium, potassium, chloride, and total CO2 - ✔✔sodium, potassium, chloride, and
total CO2
In respiratory acidosis, a compensatory mechanism is the increase in:
respiration rate
plasma bicarbonate concentration
ammonia formation
blood PC02 - ✔✔plasma bicarbonate concentration
Which of the following electrolytes is the chief plasma cation whose main function is
maintaining osmotic pressure? chloride
sodium
calcium
potassium - ✔✔sodium
The solute that contributes the most to the total serum osmolality is
glucose
chloride
urea
sodium - ✔✔sodium
A sweat chloride result of 55 mEq/L (55 mmol/L) and a sweat sodium of 52 mEq/L (52
mmol/L) were obtained on a patient who has a history of respiratory problems. The best
interpretation of these results is:
normal
normal sodium and an abnormal chloride test should be repeated
borderline results, the test should be repeated
Correct Answers| Verified Solutions Latest
2024/2025 u pdate
A blood gas sample was sent to the lab on ice, and a bubble was present in the syringe.
The blood had been exposed to room air for atleast 30 minutes. The following change in
blood gases will occur"
C02 content increased/PC02 decreased
P02 increased/ HC03 decreased
C02 content and PC02 increased/ pH increased
C02 content and PC02 decreased/pH decreased - ✔✔P02 Increased/ HC03 decreased
The following laboratory results were obtained:
Serum electrolytes
sodium: 136 mEq/L (136 mmol/L)
potassium: 4.4 mEq/L (4.4 mmol/L)
chloride: 92 mEq/L (92 mmol/L)
bicarbonate: 40 mEq/L (40 mmol/L)
Arterial blood
pH: 7.32
PCO2: 79 mm Hg
These results are most compatible with:
respiratory alkalosis
respiratory acidosis
,metabolic alkalosis
metabolic acidosis - ✔✔respiratory acidosis
Select the test which evaluates renal tubular function
osmolarity
IVP
creatinine clearance
osmolarity
microscopic urinalysis - ✔✔osmolarity
A patient had the following serum results:
Na+: 140 mEq/L (140 mmol/L)
K+: 4.0 mEq/L (4.0 mmol/L)
glucose: 95 mg/dL (5.2 mmol/L)
BUN: 10 mg/dL (3.57 mmol/L)
Which osmolality is consistent with these results?
188
204
270
390 - ✔✔204
What battery of tests is most useful in evaluating an anion gap of 22 mEq/L (22
mmol/L)?
Ca++, Mg++, PCT4 and pH
,AST, ALT, LD and amylase
glucose, CK, myoglobin and cryoglobulin
BUN, creatinine, salicylate and methanol - ✔✔BUN, creatinine, salicylate and
methanol
A patient with myeloproliferative disorder has the following values
Hgb: 13 g/dL (130 mmol/L) Hct: 38%
WBC: 30 x 103/|JL (30 x 109/L) platelets: 1000 x 103/pL (1000 x 109/L) serum Na+: 140
mEq/L (140 mmol/L) serum K+: 7 mEq/L (7 mmol/L)
The serum K+ should be confirmed by:
testing heparinized plasma
repeat testing of the original serum
testing freshly drawn serum
atomic absorption spectrometry - ✔✔testing heparinized plasma
Serum "anion gap" is increased in patients with:
renal tubular acidosis
diabetic alkalosis
lactic acidosis
metabolic acidosis due to diarrhea - ✔✔lactic acidosis
The anion gap is useful for quality control of laboratory results for:
amino acids and proteins
blood gas analyses
calcium, phosphorus and magnesium
, sodium, potassium, chloride, and total CO2 - ✔✔sodium, potassium, chloride, and
total CO2
In respiratory acidosis, a compensatory mechanism is the increase in:
respiration rate
plasma bicarbonate concentration
ammonia formation
blood PC02 - ✔✔plasma bicarbonate concentration
Which of the following electrolytes is the chief plasma cation whose main function is
maintaining osmotic pressure? chloride
sodium
calcium
potassium - ✔✔sodium
The solute that contributes the most to the total serum osmolality is
glucose
chloride
urea
sodium - ✔✔sodium
A sweat chloride result of 55 mEq/L (55 mmol/L) and a sweat sodium of 52 mEq/L (52
mmol/L) were obtained on a patient who has a history of respiratory problems. The best
interpretation of these results is:
normal
normal sodium and an abnormal chloride test should be repeated
borderline results, the test should be repeated
