Comprehensive Professional Examination Chronic Kidney Disease (Ckd): Overview & Clinical Guidelines

COMPREHENSIVE PROFESSIONAL EXAMINATION
CHRONIC KIDNEY DISEASE (CKD): OVERVIEW & CLINICAL GUIDELINES
Question 1: According to KDIGO guidelines, what is the minimum
duration of kidney damage or reduced glomerular filtration rate (GFR)
required to establish a diagnosis of Chronic Kidney Disease (CKD)?
A) 1 month
B) 3 months
C) 6 months
D) 12 months
Correct Answer: B
Clinical Rationale: KDIGO guidelines define Chronic Kidney Disease as
abnormalities of kidney structure or function, present for >= 3
months, with implications for health.

Question 2: Which of the following markers of kidney damage is
sufficient on its own to diagnose CKD, regardless of the GFR value?
A) Serum creatinine of 1.2 mg/dL
B) Persistent albuminuria (ACR >= 30 mg/g)
C) Mild benign prostatic hypertrophy
D) Occasional trace hematuria without red cell casts
Correct Answer: B
Clinical Rationale: Markers of kidney damage include persistent
albuminuria (ACR >= 30 mg/g), urine sediment abnormalities,
electrolyte disorders due to tubular disorders, structural
abnormalities detected by imaging, and history of kidney
transplantation, lasting >= 3 months.

,Question 3: What is the normal threshold for adult Glomerular
Filtration Rate (GFR) unadjusted for body surface area, expressed in
mL/min/1.73 m²?
A) >= 60 mL/min/1.73 m²
B) >= 90 mL/min/1.73 m²
C) >= 120 mL/min/1.73 m²
D) >= 140 mL/min/1.73 m²
Correct Answer: B
Clinical Rationale: A GFR of >= 90 mL/min/1.73 m² is categorized as
normal or high (Stage G1), provided there are no other markers of
kidney damage.

Question 4: A patient has a measured GFR of 48 mL/min/1.73 m² with
no evidence of structural kidney damage or albuminuria. Which
KDIGO GFR category does this patient fall into?
A) G2
B) G3a
C) G3b
D) G4
Correct Answer: B
Clinical Rationale: Stage G3a spans GFR 45–59 mL/min/1.73 m².
Stage G3b spans 30–44 mL/min/1.73 m².

Question 5: What is the primary hemodynamic mechanism in early
diabetic nephropathy leading to hyperfiltration and eventual
glomerular injury?
A) Efferent arteriolar vasoconstriction and afferent arteriolar
vasodilation

, B) Afferent arteriolar vasoconstriction and efferent arteriolar
vasodilation
C) Glomerular capillary hypotension
D) Direct destruction of podocytes by complement activation
Correct Answer: A
Clinical Rationale: Intraglomerular hypertension is driven by selective
dilation of the afferent arteriole and constriction of the efferent
arteriole, increasing glomerular capillary hydraulic pressure and
causing hyperfiltration.

Question 6: As functional nephrons are lost in CKD, how do the
remaining nephrons adapt to maintain total GFR in the early stages?
A) Glomerular atrophy and tubulogenesis
B) Compensatory hypertrophy and hyperfiltration
C) Decreased single-nephron GFR
D) Upregulation of sodium reabsorption in the collecting duct only
Correct Answer: B
Clinical Rationale: Remaining nephrons undergo compensatory
hypertrophy and hyperfiltration, maintaining overall systemic GFR
initially at the expense of accelerated intraglomerular pressure and
long-term glomerulosclerosis.

Question 7: Which pathological finding is considered the histological
hallmark of progressive renal scarring and tubulointerstitial fibrosis in
CKD?
A) Glomerular hypercellularity
B) Tubulointerstitial fibrosis and tubular atrophy
C) Neutrophilic infiltration of the loop of Henle
D) Deposition of IgA immune complexes in the mesangium

, Correct Answer: B
Clinical Rationale: Regardless of the initial insult, the final common
pathway of progressive CKD involves tubulointerstitial fibrosis,
tubular atrophy, and glomerulosclerosis.

Question 8: According to KDIGO albuminuria categories, what defines
severe albuminuria (formerly known as macroalbuminuria)?
A) ACR < 30 mg/g (< 3 mg/mmol)
B) ACR 30–300 mg/g (3–30 mg/mmol)
C) ACR > 300 mg/g (> 30 mg/mmol)
D) ACR > 2200 mg/g
Correct Answer: C
Clinical Rationale: KDIGO albuminuria categories are A1: < 30 mg/g
(normal to mildly increased), A2: 30–300 mg/g (moderately
increased), and A3: > 300 mg/g (severely increased).

Question 9: Which of the following is the most common etiology of
CKD worldwide and in the United States?
A) Glomerulonephritis
B) Autosomal Dominant Polycystic Kidney Disease (ADPKD)
C) Diabetic Kidney Disease (Diabetic Nephropathy)
D) Chronic Tubulointerstitial Nephritis
Correct Answer: C
Clinical Rationale: Diabetes mellitus is the leading cause of CKD,
accounting for approximately 40–50% of all end-stage kidney disease
(ESKD) cases, followed closely by hypertension.