Medical Laboratory Scientist ASCP Practice Exam 2025 – Complete Study Guide

Calcium oxalate crystals can indeed be found in both acidic and alkaline urine, which makes this answer particularly significant in the context of urinary crystallization. These crystals are the result of calcium combining with oxalate, a normal component of urine.

The presence of calcium oxalate crystals in urine is common and can vary depending on diet, hydration status, and underlying metabolic conditions. In acidic urine, calcium oxalate typically appears in the form of envelope or dumbbell shapes, while in alkaline urine, they may present as more varied forms but are still identifiable as calcium oxalate.

Understanding that calcium oxalate is versatile in regard to urine pH helps clinicians and laboratorians in diagnosing and managing conditions associated with kidney stones, which may lead to patient interventions aimed at dietary or lifestyle changes.

The other answer choices represent specific entities or conditions with more restricted occurrences. For instance, homogentisic acid crystals are typically associated with acidic urine and are linked to a rare metabolic condition called alcaptonuria. Amorphous phosphate crystals are usually associated with alkaline urine, while bilirubin crystals are primarily found in acidic urine related to conditions such as liver disease or hemolysis. Thus, recognizing the versatile nature of calcium oxal