tietz fundamentals of clinical chemistry and molec
8th edition tietz fundamentals of clinical chemis
rifai tietz fundamentals of clinical chemistry and
Connected book
Book Title:
Author(s):
Edition:
ISBN:
Edition:
More summaries for
Tietz Fundamentals of Clinical Chemistry and Molecular Diagnostics, 8th Edition by Nader Rifai,
All for this textbook (2)
Written for
Tietz Fundamentals of Clinical Chemistry and Molec
All documents for this subject (16)
Seller
Follow
kushboopatel6867
Reviews received
Content preview
TEST BANK For Tietz Fundamentals of Clinical Chemistry and
Molecular Diagnostics, 8th Edition by Nader Rifai,
true negatives / (false positives + true negatives) is the formula for determining: -
ANSWER:specificity
The proportion of a population that has the particular disease being studied is
referred to as the: - ANSWER:Prevalence
What is the positive predictive value of a test in which 220 individuals with positive
test results actually have the disease and 45 individuals with positive test rates do
not have the disease? - ANSWER:83%. 220/(220+45)
In regard to the number of true-positive and negative, and false-positive and
negative, results in laboratory testing the prevalence times the sensitivity is equal to
the number of: - ANSWER:True positives
Calculate the sensitivity for the following data: in a group of 80 patients diagnosed
with sickle cell disease, 72 tested positively for it. The sensitivity of this test is: -
ANSWER:72/(72+8) * 100 = 90%
A receiver operating characteristic (ROC) curve is a plot of: - ANSWER:True positives
versus false positives
ROC curves are most useful in assessing the performance of quantitative laboratory
analysis because: - ANSWER:They can display performance of tests over the entire
range of decision values
A laboratory analysis that produces quantitative results with an infinite number of
sensitivity and specificity pairs is referred to as a _________ test. -
ANSWER:Continuous
Non-diseased individuals that are classified as diseased by having a positive result on
a specific laboratory test are considered: - ANSWER:False positive
Combination testing involves the use of multiple laboratory tests in an attempt to
decrease costs or assist in diagnosing a specific disease. One of the problems with
this type of testing is that: - ANSWER:False-positive results increase
A method that can be used to calculate the probability of a disease after new
information is added to previously obtained information involves: - ANSWER:Bayes
theorem
To calculate the sensitivity of a laboratory test to correctly classify true positives, one
must first know the number of: - ANSWER:True positives and false negatives
, To calculate the predictive value of a positive test, which of the following should be
known? - ANSWER:sensitivity, specificity, and prevalence
The probability of occurrence of a specific test value given that the disease is present
divided by the probability of the same test value if the disease was absent is the: -
ANSWER:likelihood ratio
In regard to clinical evaluation of method, a high clinical sensitivity means few false
negatives. - ANSWER:True
Even in somewhat impractical, which one of the following pre-analytical factors
should be standardized when establishing a reference interval for an analyze? -
ANSWER:The method of specimen collection
To determine the confidence intervals of percentiles of ranked data (data arranged
by magnitude of value), it is most appropriately assessed using: -
ANSWER:Nonparametric testing
True negatives / (false positives + true negatives) * 100 is the formula for
determining: - ANSWER:Clinical specificity
Calculate the clinical sensitivity for the following data: in a group of 80 patients
diagnosed with sickle cell disease, 72 had positive test results. The clinical sensitivity
of the test is: - ANSWER:72/80 * 100 = 90%
Which one of the following is an example of an exclusion criterion when establishing
a healthy population-based reference interval? - ANSWER:Use of oral contraceptives
An important assumption that is made when using parametric methods to estimate
percentiles and their confidence intervals in determining reference limits is that: -
ANSWER:the true distribution that the reference values exhibit is Gaussian
A physician asked your laboratory to being performing thyroid-stimulating hormone
(TSH) analyses on all specimens that have a free thyroxine (FT4) analysis ordered, a
practice that your laboratory currently does not perform. Your laboratory typically
performs TSH only on these FT4 specimens that are outside the population-based
reference interval. The physician suggests using subject-based reference intervals,
claiming that population-based intervals are clinically insensitive. What is the basis of
the claim? - ANSWER:Changes in a subject-based reference value might indicate
altered biochemical status yet still be within the population-based healthy reference
interval.
What the statistical range of the following distribution of the data?
21 25 18 20 19 21 23 26 - ANSWER:8
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller kushboopatel6867. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
