Final answer:
Envelope shaped crystals on urinalysis are suggestive of kidney stones. Kidney stones are solid crystals that form in the kidneys from minerals in urine.
Step-by-step explanation:
Envelope shaped crystals on urinalysis are suggestive of kidney stones. Some substances in urine have the ability to crystallize and, in a concentrated form, can precipitate into solid deposits attached to the kidney walls. These crystals can grow and form kidney stones through a process of accretion.
Kidney stones, also known as renal calculi, are solid crystals that form in the kidneys from minerals in urine. The majority of kidney stones consist of crystals of calcium salts. When kidney stones grow large enough, they may block the ureter, causing pain and potentially damaging the kidneys.