⚠ Please, do not confuse them with red blood cells! 👉 Ovoid calcium oxalate crystals. Urine sediment microscopy.
✅ “Envelope” shaped crystals are a well-known and frequently encountered variety of calcium oxalate salts. However, the oval forms of these crystals can cause interpretation difficulties and be mistakenly identified as red blood cells.
❗To avoid confusion, it is sufficient to carefully adjust the microscope’s fine focus knob: the characteristic opalescence and light refractions, typical of these crystals, will help distinguish them from red blood cells, for which such optical effects are not characteristic!
🙏 Material kindly provided by KDL biologist Yulia Guseva GBUZ Belorechenskaya Central District Hospital.
