Normal Urinary Crystals Flashcards
APPEARANCE: “Thorny Apples” –Spicule covered
spheres; Brown in color
Urine pH: Acid
AMMONIUM BIURATE
APPEARANCE: Yellow-Brown Granules
Urine pH: Acid
AMORPHOUS URATES
Most often encountered in: Old Specimen
▪ Associated with Ammonia produced by Urea Splitting Bacteria
AMMONIUM BIURATE
Urine pH: Acid / Neutral / Alkaline
CALCIUM OXALATE
This is Colorless, Octahedral envelope or as two pyramids joined at their base and this is the most common form.
DIHYDRATE
This is Oval or Dumbbell shaped
Ethylene Glycol “Antifreeze” Poisoning
MONOHYDRATE
Majority of renal calculi is composed of ?
CaOx or Calcium Oxalate
Urine pH: Acid
APPEARANCE: Rhombic, Four–sided flat plates
[whetstones], Wedges, Rosettes
URIC ACID
HIGHLY BIREFRINGENT: Distinguishing feature from Cystine Crystals
Uric Acid
This is significantly increased in Gout and Lesch-Nyhan Syndrome
Uric Acid
Urine pH: Alkaline
APPEARANCE: Similar to Amorphous Urates
[distinguished by Urine pH]
AMORPHOUS PHOSPHATE
Refrigeration: White Sediment
AMORPHOUS PHOSPHATE
When refrigerated it gives Pink Sediment
Amorphous Urates
Urine pH: Alkaline
APPEARANCE: Small, Colorless, Dumbbell of Spherical
shapes
CALCIUM CARBONATE
Resembles AMORPHOUS MATERIAL – distinguished by addition of ACETIC ACID [formation of gas]
CALCIUM CARBONATE
Dissolves at 60 degC and convert into Uric Acid
Crystals when Glacial Acetic Acid is added
AMMONIUM BIURATE
Urine pH: Alkaline
APPEARANCE: Colorless, Flat rectangular plates, Thin
prisms in rosette form
CALCIUM PHOSPHATE
This crystal is confused with sulfonamide crystals when urine pH is in neutral range
CALCIUM PHOSPHATE
Distinguished by addition of DILUTE ACETIC ACID: Calcium Phosphate
It dissolves
Distinguished by addition of DILUTE ACETIC ACID: Sulfonamide
It does not dissolve
a.k.a. “Ammonium Magnesium Phosphate”
TRIPLE PHOSPHATE
Urine pH: Alkaline
APPEARANCE: Prism Shape, resembles “Coffin Lid”
TRIPLE PHOSPHATE
