@gethelpwithproctoredexam: 1. Calcium Oxalate (Most Common) Crystal Shape: Envelope-shaped (bipyramidal). Urinary pH: Forms in acidic urine. 💥Key Mechanism: Often linked to fat malabsorption (e.g., Crohn’s disease). Unabsorbed fats bind calcium in the gut, leaving oxalate "free" to be absorbed and later precipitated in the kidney. 💥Pearl: Thiazide diuretics are used for prevention because they increase calcium reabsorption in the distal convoluted tubule, lowering urinary calcium levels. 2. Struvite (Ammonium Magnesium Phosphate) Crystal Shape: Coffin lid-shaped. Urinary pH: Forms in alkaline urine (pH>7). 💥Key Mechanism: Caused by infection with urease-positive bacteria (e.g., Proteus, Klebsiella). These organisms split urea into ammonia, raising the pH. 💥Pearl: These often form "staghorn calculi," which are too large to pass and require surgical intervention. 3. Uric Acid Crystal Shape: Rhomboid or needle-shaped. Urinary pH: Forms in acidic urine. 💥Key Mechanism: Associated with high cell turnover (Hyperuricemia), such as in Gout, Leukemia/Lymphoma (Tumor Lysis Syndrome), or Lesch-Nyhan syndrome. 💥Pearl: These stones are radiolucent (invisible on X-ray) but visible on CT scans. 4. Cystine Crystal Shape: Hexagonal. Urinary pH: Forms in acidic urine. 💥Key Mechanism: A hereditary (autosomal recessive) defect in the COLA transporter (Cysteine, Ornithine, Lysine, Arginine) in the proximal tubule. 💥Pearl: Diagnosed with a positive cyanide-nitroprusside test, which turns the urine magenta. #medstudent #nursingschool #nursingnotes #examhelp #student

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Thursday 02 April 2026 00:07:25 GMT