Success! In Clinical Laboratory Science – Urinalysis and Body Fluids (UA/BF) Practice Test

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Which statement best characterizes urinary crystals that may resemble cysteine crystals?

They never appear in freshly collected samples

They can resemble other crystals such as cysteine

Crystals seen in urine can have morphologies that look alike even when they are different substances. Because of this, appearance alone isn’t definitive for identification. The best description is that these crystals may resemble other crystals, such as cysteine, highlighting the need for additional testing or clues to confirm their identity. Fresh samples can contain crystals, not all crystals dissolve easily in alkaline urine, and simply finding crystals does not by itself diagnose a metabolic disorder—though certain crystals can raise suspicion and prompt further testing.

They dissolve easily in alkaline urine

Their presence alone confirms a metabolic disorder

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