WorksheetsClinical Biochemistry 1st lecture
Total questions: 50
Worksheet time: 25mins
What is the role of clinical biochemistry in healthcare?
Diagnosing diseases
Measuring blood pressure
Treating diseases
Administering drugs
What type of sample is commonly used in clinical biochemistry tests?
Sweat
Plasma or serum
Saliva
Hair
Which test measures blood glucose levels over a period of 3 months?
B-HCG
Hemoglobin A1C
TSH
Creatinine
Which substance is commonly measured to monitor liver function?
Creatinine
ALT (Alanine aminotransferase)
Glucose
Sodium
What is the main purpose of Point-of-Care Testing (POCT)?
To analyze DNA
To perform tests near the patient
To increase test accuracy
To detect rare diseases
Which electrolyte is part of the core biochemical tests?
Sodium
Glucose
Albumin
Bilirubin
What is the primary analyte measured in tests for hypothyroidism?
TSH (Thyroid Stimulating Hormone)
Glucose
Calcium
ALT
Which type of interference affects test results by increasing turbidity?
Hemolysis
Lipemia
Fibrin clots
Bilirubinemia
Which organ system is most commonly tested using ALT and AST enzymes?
Kidney
Heart
Liver
Brain
What is a 'core analysis' in clinical biochemistry?
Test for DNA analysis
Commonly requested tests like electrolytes and glucose
A specialized protein test
Drug concentration tests
Which condition can be diagnosed using the serum free T4 and TSH test?
Diabetes mellitus
Hyperthyroidism
Hypocalcemia
Hypertension
Which laboratory process is associated with the largest number of errors?
Analytical phase
Pre-analytical phase
Post-analytical phase
Test ordering phase
Which phase of laboratory testing includes specimen collection and transport?
Analytical phase
Pre-analytical phase
Post-analytical phase
Interpretive phase
What does the specificity of a diagnostic test measure?
The proportion of actual positives correctly identified
The proportion of actual negatives correctly identified
The accuracy of the test
The likelihood of a false positive result
Which of the following is a biological source of variation in test results?
Instrumental precision
Hemolysis
Patient's diet
Laboratory error
Which test can be used to confirm a diagnosis of jaundice?
Serum ALT
Serum bilirubin
Serum creatinine
Serum albumin
What is the importance of POCT in emergency departments?
Fast turnaround for real-time management decisions
Increased accuracy over lab tests
Reduced staff workload
Elimination of test errors
Which laboratory phase includes test results transmission and follow-up?
Analytical phase
Post-analytical phase
Pre-analytical phase
Pre-testing phase
What does analytical sensitivity measure?
The ability to detect small amounts of the analyte
The accuracy of test results
The likelihood of cross-contamination
The number of false positives
Which drug commonly interferes with serum transaminase results?
Paracetamol
Erythromycin
Aspirin
Metformin
Why is fasting required for some laboratory tests?
To prevent dehydration
To avoid postprandial glucose variations
To reduce hemolysis
To stabilize blood pressure
How does posture affect serum proteins during blood collection?
Standing decreases serum protein concentration
Standing increases serum protein concentration
Posture has no effect
Posture decreases serum bilirubin
Which sample error can result from incorrect phlebotomy technique?
Increased glucose
Hemolysis
Decreased potassium
Elevated calcium
Which laboratory test is commonly used for diabetic monitoring?
Serum creatinine
Hemoglobin A1C
Thyroid panel
Liver enzymes
What effect does a tourniquet have if applied too long during venipuncture?
Causes hemolysis
Concentrates serum components
Reduces serum bilirubin
Causes hypocalcemia
Which factor does not affect test accuracy?
Biological variation
Precision
Posture
Timing
What is the major drawback of POCT tests compared to laboratory-based tests?
Poor analytical sensitivity
Longer test time
Lack of real-time results
None of the above
What is the main challenge of interpreting test results during drug administration?
Drug-drug interactions
Analytical and biological interferences
False positives
Test precision
Which variation factor is associated with high caffeine intake?
Decreased glucose tolerance
Elevated serum proteins
Increased bilirubin
Elevated serum calcium
Which clinical condition can lead to increased bilirubin in serum?
Hemolytic anemia
Hypertension
Hypothyroidism
Heart failure
What impact does renal failure have on serum drug levels?
Increased drug clearance
Reduced drug clearance
No effect
Increased liver enzyme levels
Which laboratory test is crucial in monitoring patients with pancreatitis?
Serum amylase
ALT
Creatinine
Hemoglobin
Which test is used to confirm a diagnosis of Cushing's syndrome?
Serum ACTH
Serum creatinine
TSH
ALT
What is the primary purpose of clinical biochemistry laboratories?
To diagnose diseases
To treat diseases
To perform surgical procedures
To provide nutritional advice
Which of the following is a 'core analysis' in clinical biochemistry?
Genetic sequencing
Routine cholesterol test
MRI scans
Cancer immunotherapy
What does POCT stand for in clinical biochemistry?
Post-operative Clinical Testing
Point-of-Care Testing
Patient-Oriented Clinical Trials
Prolonged Observation of Clinical Trends
What is a major advantage of Point-of-Care Testing (POCT)?
Requires transportation of samples
Minimal invasiveness and rapid results
Can only be conducted in hospital laboratories
More accurate than laboratory tests
Which of the following is an example of an analytical source of variation?
Time of day
Sensitivity and specificity
Stress and anxiety
Age of the patient
Sensitivity in a clinical test measures the ability to:
Detect how much of an analyte is present
Differentiate between similar analytes
Identify true positive results
Identify true negative results
Biological variation in clinical tests can be affected by all EXCEPT:
Patient's diet
Test calibration
Time of day
Patient's posture
Which hormone's levels vary significantly with time of day?
Insulin
Cortisol
Thyroid-stimulating hormone (TSH)
Estrogen
A blood sample showing pale red to cherry red plasma might indicate:
Lipemia
Hemolysis
Hypoglycemia
Jaundice
The presence of excess lipids in the bloodstream can cause serum to appear:
Pale yellow
Cloudy or milky
Bright red
Clear
An increase in serum creatinine levels due to exercise is an example of:
Analytical variation
Biological variation
Test interference
Analytical error
Which is a test commonly used to monitor diabetes?
Lipase
Hemoglobin A1C
ALT (Alanine Aminotransferase)
Thyroid panel
Drug interference in laboratory tests may cause results to be:
Accurate
Unaffected by the drug
Falsely positive or negative
More precise
Which factor is NOT likely to interfere with a lab test result?
Recent antibiotic therapy
Patient's recent posture
Patient's favorite color
Time since last meal
Which of the following is true regarding pre-analytical errors?
They occur due to faulty interpretation of results
They occur in the specimen collection phase
They are due to faulty analytical machines
They result only from biological variations
How does hemolysis affect certain blood test results?
Decreases levels of hemoglobin
Releases intracellular contents into serum
Only affects lipid levels
Has no impact on blood test results
A specimen's appearance is 'icteric' due to:
Excess iron
High bilirubin levels
Presence of triglycerides
Low cholesterol levels
