Boc Flashcards
A patient with myeloproliferative disorder has the following values:
Hgb:
Hct:
WBC:
platelets:
serum Nat:
serum K+:
13 g/dL (130 mmol/L)
38%
30 x 103/uL (30 x 109/L)
1000 x 10 /μL (1000 x 109/L)
140 mEq/L (140 mmol/L)
7 mEq/L (7 mmol/L)
The serum Kt should be confirmed by:
arepeat testing of the original serum
testing freshly drawn serum
testing heparinized plasma
atomic absorption spectrometry
C
48
What battery of tests is most useful in evaluating an anion gap of 22 mEq/L (22 mmol/L)?
Catt, Mgt, PO4 and pH
BUN, creatinine, salicylate and methanol
c AST, ALT, LD and amylase
d glucose, CK, myoglobin and cryoglobulin
B
The degree to which the kidney concentrates the glomerular filtrate can be determined by:
a urine creatine
b serum creatinine
creatinine clearance
durine to serum osmolality ratio
D
29
Factors that contribute to a PCO2 electrode requiring 60-120 seconds to reach equilibrium include the:
diffusion characteristics of the membrane
actual blood PO
ctype of calibrating standard (ie, liquid or humidified gas)
d potential of the polarizing mercury cell
A
25
What is the best method to diagnose lactase deficiency?
H breath test
b plasma aldolase level
c LDH level
d D-xylose test
A
14
Which one of the following values obtained during a glucose tolerance test are diagnostic of diabetes mellitus?
2-hour specimen = 150 mg/dL (8.3 mmol/L)
Fasting plasma glucose = 126 mg/dL (6.9 mmol/L)
fasting plasma glucose = 110 mg/dL (6.1 mmol/L)
2-hour specimen = 180 mg/dL (9.9 mmol/L)
B
12
In the fasting state, the arterial and capillary blood glucose concentration varies from the venous glucose concentration by approximately how many mg/dL (mmol/L)?
1 mg/dL (0.05 mmol/L) higher
5 mg/dL (0.27 mmol/L) higher
10 mg/dL (0.55 mmol/L) lower
d 15 mg/dL (0.82 mmol/L) lower
B
9
Serum levels that define hypoglycemia in pre-term or low birth weight infants are:
a the same as adults
b lower than adults
c the same as a normal full-term infant
d higher than a normal full-term infant
B
98
MLS
ONLY
The identification of Bence Jones protein is best accomplished by:
a sulfosalicylic acid test
urine reagent strips
immunofixation
aelectrophoresis
C
70 A low concentration of serum phosphorus is commonly found in:
patients who are receiving carbohydrate hyperalimentation
chronic renal disease
hypoparathyroidism
d patients with pituitary tumors
A
61 A physician requested that electrolytes on a multiple myeloma patient specimen be run by direct ISE and not indirect ISE because:
a excess protein binds Na in indirect ISE
Na is falsely increased by indirect ISE
Na is falsely decreased by indirect ISE
excess protein reacts with diluent in indirect ISE
C
60
Sodium determination by indirect ion selective electrode is falsely decreased by:
elevated chloride levels
belevated lipid levels
decreased protein levels
d decreased albumin levels
B
59
Which of the following is true about direct ion selective electrodes for electrolytes?
whole blood specimens are acceptable
b elevated lipids cause falsely decreased results
celevated proteins cause falsely decreased results
d elevated platelets cause falsely increased results
A
125 Serum concentrations of vitamin B12 are elvated in:
MLS
ONLY
a pernicious anemia in relapse
bpatients on chronic hemodialysis
chronic granulocytic leukemia
Hodgkin disease
C
135 In bilirubin determinations, the purpose of adding a concentrated caffeine solution or methyl MLS ONLY
alcohol is to:
allow indirect bilirubin to react with color reagent
dissolve conjugated bilirubin
c precipitate protein
d prevent any change in pH
A
148 A condition in which erythrocyte protoporphyrin is increased is: MLS
ONLY
acute intermittent porphyria
biron deficiency anemia
C porphyria cutanea tarda
d acute porphyric attack
B
117 Which of the following substances is the biologically active precursor of a fat soluble vitamin?
MLS
ONLY
biotin
B retinol
folic acid
d ascorbic acid
B
115 Technical problems encountered during the collection of an amniotic fluid specimen caused doubt y as to whether the specimen was amniotic in origin. Which 1 of the following procedures would best establish that the fluid is amniotic in origin?
a measurement of absorbance at 450 nm
b creatinine measurement
lecithin/sphingomyelin ratio
d human amniotic placental lactogen (HPL)
B
110 A patient with glomerulonephritis is most likely to present with the following serum results: MIS
ONLY
a creatinine decreased
b calcium increased
phosphorous decreased
dBUN increased
D
102
MLS ONLY
An elevated serum iron with normal iron binding capacity is most likely associated with:
a iron deficiency anemia
renal damage
pernicious anemia
d septicemia
C
What specimen preparation is commonly used to perform the alkaline phosphatase isoenzyme determination?
a_serum is divided into 2 aliquots, one is frozen and the other is refrigerated
serum is divided into 2 aliquots, one is heated at 56°C and the other is unheated
no preparation is necessary since the assay uses EDTA plasma
d protein-free filtrate is prepared first
B
186 Regan isoenzyme has the same properties as alkaline phosphatase that originates in the:
a skeleton
b kidney
intestine
d placenta
D
187 The most heat labile fraction of alkaline phosphatase is obtained from:
a liver
bebone
Lintestine
a placenta
B
187 The most heat labile fraction of alkaline phosphatase is obtained from:
a liver
bebone
Lintestine
a placenta
B
