Which biochemical abnormality is not seen in CRF?

Correct Answer: D

Rationale: Increased erythropoietin isn't CRF levels drop, causing anemia (e.g., renal failure), incorrect. Secondary hyperparathyroidism (phosphate retention), hypocalcemia (low vitamin D), and hyperphosphatemia (excretion loss) all classic. Erythropoietin deficiency distinguishes the error, key to CRF's anemia, unlike metabolic shifts.

Correct Answer: D

Rationale: Urethral prolapse doesn't typically cause postrenal failure rare obstruction (e.g., females), unlike bladder tumor (outflow block), phimosis (urethral), and neurogenic bladder (emptying failure). Minimal obstructive impact distinguishes it, key to postrenal etiology, unlike clear blockages.

Correct Answer: D

Rationale: Above 180 mg/dL (renal threshold), glucose filtration exceeds reabsorption capacity, increasing filtered and excreted amounts not fixed, equal, or absent in urine. This reflects glycosuria dynamics, key for diabetes monitoring, contrasting with normal reabsorption limits.

Correct Answer: A

Rationale: Cercarial dermatitis results from non-human schistosomes penetrating skin, not S. mansoni/haematobium (human parasites) or Trichomonas (STD). This distinguishes parasitic dermatitis, critical for epidemiology, contrasting with human-specific species.

Correct Answer: B

Rationale: Renal cell carcinoma (RCC) invades veins early, has clear cells, causes hematuria, and affects adults not children (Wilms'). This corrects RCC epidemiology, vital for diagnosis, contrasting with pediatric tumors.