#1
Which of the following is not a suitable specimen for urine culture?
Urine collected after meals
ExplanationUrine collected after meals may have contaminants.
#2
Which of the following is a suitable specimen for testing for Helicobacter pylori?
Feces
ExplanationFecal samples can contain H. pylori DNA.
#3
Which of the following is an appropriate method for collecting a urine specimen for drug testing?
Using a preservative-free container
ExplanationPreservative-free containers prevent contamination of drug samples.
#4
Which of the following is the preferred site for venipuncture to collect blood for a complete blood count (CBC)?
Median cubital vein
ExplanationMedian cubital vein offers easy access and minimal discomfort.
#5
Which of the following is a suitable specimen for testing for HIV?
Saliva
ExplanationSaliva can contain HIV antibodies.
#6
What is the recommended anticoagulant for blood specimen collection for complete blood count (CBC)?
EDTA (Ethylenediaminetetraacetic acid)
ExplanationEDTA is preferred for preserving blood cell morphology.
#7
Which of the following is a critical step in collecting a throat swab for culture?
Avoiding touching the tongue or buccal mucosa
ExplanationTouching non-target areas can contaminate the swab.
#8
What is the primary purpose of collecting a stool sample?
To detect parasites or bacterial infections
ExplanationStool samples help identify gastrointestinal pathogens.
#9
Which of the following is a critical factor in maintaining the integrity of a blood culture specimen?
Collecting the specimen in a sterile container
ExplanationSterile containers prevent contamination.
#10
What is the recommended storage temperature for a stool specimen before testing for ova and parasites?
Refrigerated
ExplanationRefrigeration preserves specimen integrity.
#11
Which of the following specimens is collected by a lumbar puncture?
Cerebrospinal fluid
ExplanationCSF is obtained from the lumbar region for testing.
#12
What does the term 'chain of custody' refer to in specimen collection?
Maintaining a record of everyone who handled the specimen
ExplanationIt ensures the integrity and accountability of specimen handling.
#13
In which situation is a sputum specimen typically collected?
To assess lung infections or diseases
ExplanationSputum is indicative of respiratory conditions.
#14
What is the recommended technique for collecting a wound culture specimen?
Collecting from the surrounding healthy tissue
ExplanationHealthy tissue reduces contamination risk.
#15
Which of the following specimens is typically collected for tuberculosis (TB) testing?
Sputum
ExplanationSputum can contain TB bacteria.
#16
What is the primary reason for proper labeling of specimens?
To prevent errors and ensure accurate identification
ExplanationLabels avoid mix-ups and maintain sample integrity.
#17
Which of the following is a common preservative used for urine specimens in toxicology testing?
Sodium fluoride
ExplanationSodium fluoride prevents degradation of toxicology samples.