🩺 Q873: A 35-year-old female presents with malar rash, joint pain, and photosensitivity. Laboratory results show a positive ANA (1:640, homogeneous pattern) and positive anti-dsDNA. Which complement profile is most consistent with active systemic lupus erythematosus (SLE) nephritis?
Anonymous Quiz
30%
A) Elevated C3 and C4
30%
B) Decreased C3 and C4
40%
C) Normal C3, decreased C4
0%
Decreased C3, normal C4
🩺 Q874: A patient with a primary chancre is tested for syphilis. The RPR is non-reactive, but the TP-PA is reactive. What is the most likely clinical interpretation?
Anonymous Quiz
0%
A) False positive TP-PA due to cross-reactivity
10%
B) Prozone phenomenon in the RPR test
90%
C) Early primary syphilis where treponemal antibodies appear before non-treponemal
0%
D) Past treated infection with no current activity
🩺 Q875: A patient develops urticaria and hypotension minutes after receiving an intravenous infusion of a monoclonal antibody. This reaction is classified as which type of hypersensitivity?
Anonymous Quiz
10%
A) Type I
30%
B) Type II
60%
C) Type III
0%
D) Type IV
🩺 Q876: A patient's Hepatitis B profile shows: HBsAg negative, Anti-HBs positive, Anti-HBc (total) positive, IgM Anti-HBc negative. What is the interpretation?
Anonymous Quiz
20%
Acute Hepatitis B infection
30%
B) Chronic Hepatitis B infection
0%
C) Susceptible to Hepatitis B
50%
D) Recovery from past Hepatitis B infection
🩺 Q877: Which laboratory finding is most characteristic of X-linked Bruton's agammaglobulinemia?
Anonymous Quiz
10%
A) Elevated IgE and eosinophilia
90%
B) Markedly low or absent serum immunoglobulins and B-cells
0%
C) Normal IgG, low IgM and IgA
0%
D) High T-cell count with low NK-cells
🩺 Q878: A patient with suspected Rheumatoid Arthritis (RA) has a negative Rheumatoid Factor (RF) test. Which additional serological marker is highly specific for the diagnosis of RA?
Anonymous Quiz
90%
Anti-CCP (Cyclic Citrullinated Peptide)
0%
B) Anti-Smith antibody
10%
C) Anticentromere antibody
0%
D) Anti-dsDNA
🩺 Q879: In a competitive immunoassay, what is the relationship between the concentration of the unlabeled analyte and the measured signal?
Anonymous Quiz
50%
A) Directly proportional
50%
B) Inversely proportional
0%
C) No relationship
0%
D) Sigmoidal relationship
🩺 Q880: A patient has an HIV screening test performed using a 4th generation Ag/Ab combination assay. The result is reactive. What is the next logical step?
Anonymous Quiz
18%
A) Report as positive for HIV-1
18%
B) Perform a Western Blot for confirmation
64%
C) Perform an HIV-1/HIV-2 antibody differentiation immunoassay
0%
D) Repeat the same 4th generation assay in duplicate
🩺 Q881: Which ANA pattern is most frequently associated with antibodies to Scl-70 in patients with systemic sclerosis?
Anonymous Quiz
9%
A) Speckled
73%
B) Homogeneous
18%
C) Peripheral
0%
D) Nucleolar
🩺 Q882: What is the primary function of the 'wash' step in an ELISA?
Anonymous Quiz
0%
A) To lyse the cells in the sample
92%
B) To remove unbound reagents to reduce background interference
8%
C) To stabilize the antigen-antibody complex
0%
D) To change the pH of the reaction mixture
🩺 Q883: A urine specimen with a high specific gravity and a positive dipstick for protein is found to have a pH of 5.0. Microscopic exam shows rhombic crystals. What are these crystals?
Anonymous Quiz
25%
A) Uric acid
42%
B) Triple phosphate
33%
C) Amorphous urates
0%
D) Calcium oxalate
🩺 Q884: Which condition is indicated by the presence of 'maltese cross' formations under polarized light in a urine sediment?
Anonymous Quiz
75%
A) Lipiduria (Oval fat bodies)
17%
B) Cystinuria
8%
C) Tyrosinuria
0%
D) Leucinuria
🩺 Q885: A dipstick test for urine bilirubin is positive, but the urobilinogen is normal. This pattern is suggestive of:
Anonymous Quiz
33%
A) Hemolytic anemia
58%
Biliary obstruction
8%
C) Liver cell damage
0%
D) Normal physiology
🩺 Q886: A urine specimen collected at room temperature for 4 hours shows a significant decrease in glucose and a rise in pH. What is the most likely cause?
Anonymous Quiz
42%
A) Bacterial overgrowth
25%
B) Renal tubular acidosis
0%
C) Diabetes mellitus
33%
D) Contamination with bleach
🩺 Q887: Waxy casts are most frequently associated with which condition?
Anonymous Quiz
58%
Acute glomerulonephritis
33%
B) Chronic renal failure
0%
C) Pyelonephritis
8%
D) Strenuous exercise
🩺 Q888: The dipstick reaction for blood is positive, but microscopic examination reveals no intact red blood cells. What is the most likely substance present in the urine?
Anonymous Quiz
42%
A) Myoglobin
42%
B) Ascorbic acid
17%
C) Nitrites
0%
D) White blood cells
🩺 Q889: [Clinical Pathology Case] In traumatic lumbar puncture vs. true subarachnoid hemorrhage, which CSF finding confirms subarachnoid hemorrhage?
Anonymous Quiz
80%
A) Supernatant xanthochromia after immediate centrifugation
20%
B) Progressive clearing of blood in consecutive collection tubes
0%
C) Formation of a fibrin clot on standing
0%
D) Equal distribution of lymphocytes and segmented neutrophils
🩺 Q890: [Clinical Pathology Case (Series #2, Case #3)] Prussian blue staining of bone marrow aspirates demonstrating iron granules encircling at least one-third of the erythroid nucleus defines:
Anonymous Quiz
82%
A) Ringed sideroblasts
18%
B) Howell-Jolly bodies
0%
C) Pappenheimer bodies
0%
D) Heinz bodies
🩺 Q891: [Clinical Pathology Case (Series #2, Case #4)] In traumatic lumbar puncture vs. true subarachnoid hemorrhage, which CSF finding confirms subarachnoid hemorrhage?
Anonymous Quiz
80%
A) Supernatant xanthochromia after immediate centrifugation
20%
B) Progressive clearing of blood in consecutive collection tubes
0%
C) Formation of a fibrin clot on standing
0%
D) Equal distribution of lymphocytes and segmented neutrophils
🩺 Q892: [Clinical Pathology Case (Series #3, Case #5)] Prussian blue staining of bone marrow aspirates demonstrating iron granules encircling at least one-third of the erythroid nucleus defines:
Anonymous Quiz
64%
A) Ringed sideroblasts
27%
B) Howell-Jolly bodies
9%
C) Pappenheimer bodies
0%
D) Heinz bodies