The condition of accumulation of urea in the blood is termed as

1. renal calculi

2. glomerulonephritis

3. uremia

4. ketonuria

(c) Uremia is accumulation of urea in blood. It occurs due to malfunctioning of kidney.
Renal calculi refers to the formation of stones or insoluble mass of crystallised salts (oxalates, etc) with in the kidney.

Glomerulonephritis is the inflammation of glomeruli of kidney.

Ketonuria is a medical condition in which ketone bodies are present in the urine. It is seen during starvation or more commonly in type 1 diabetes mellitus.