Confirm these crystals by verifying the patient's therapy. Bilirubin crystals are fine needles or granules that form clusters and are yellow-brown in color. They will be accompanied by positive chemical reaction for bilirubin on the reagent strip. Confirm these crystals by dissolving in strong acid and alkali. The arrow in this frame is pointing to a cluster of bilirubin crystals.
Cholesterol crystals are flat, rectangular plates with notched corners and are colorless.
They are found in lipiduria or with other forms of urinary fat. These crystals are confirmed by their solubility in chloroform and ether. Cystine crystals are clear, colorless hexagonal plates often appearing in layers. They can be found in the amino acid disorder of cystinuria or cystinosis. These crystals are confirmed by their solubility in alkali.