18 Questions
What is the primary method of collecting cellular material from the respiratory tract?
Sputum examination
Why is catheterization preferred in women for urinary tract cytology?
To avoid contamination by vaginal cells and menstrual blood
What is a limitation of sputum examination?
It does not allow localization of the lesion within the respiratory tract
What is the significance of a satisfactory sputum specimen in diagnosing lung cancer?
It allows diagnosis of over 80% of lung cancers
What is the purpose of aerosol-inhalation of cough stimulating substances?
To trigger the cough reflex
What is the preferred method of collecting urinary bladder washings in symptomatic patients when bladder tumors are suspected?
Washings obtained at cystoscopy
What is an alternative method of collecting cellular material from the colon?
Lavage following enema to clean the colon
Which type of cells are infrequent in urine, but more abundant in material obtained from the renal pelvis and ureter?
Renal parenchymal cells
What is the purpose of retrograde catheterization and brushing of the ureter and renal pelvis?
To localize lesions in the upper urinary tract
What is the relationship between the number of X chromosomes and the number of Barr bodies observed in interphase nuclei?
The number of Barr bodies is one less than the number of X chromosomes
What is the characteristic appearance of the Barr body in interphase nuclei?
Drumstick appearance
What is the purpose of prostatic massage in Urinary Tract Cytology?
To obtain prostatic secretions for cytological examination
Why is the initial morning specimen of urine discarded?
Because cells deteriorate extremely quickly in acidic urine
Why are 24-hour collections of urine useless for cytodiagnostic purposes?
Because the morphology of cells is distorted to an extreme degree
What is added to pericardial, pleural, and peritoneal fluids to prevent coagulation?
Heparin, sodium citrate, or EDTA
Why should CSF samples be dispatched without delay to the laboratory?
Because the cells contained are extremely fragile
What happens to smears if they are allowed to dry prior to fixation?
Drying causes distortion of cells and induces cytoplasmic staining artefacts
How long is the fixation time for smears in 95% ethanol?
10 to 15 minutes at room temperature
Learn about the different methods of collecting cytology samples from various body parts, including the colon, urinary tract, and respiratory tract.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
