Triple phosphate (ammonium magnesium phosphate) crystals are commonly seen in alkaline urine.
In their routine form, they are easily identified by their prism shape that frequently resembles a “coffin lid”.
As they disintegrate, the crystals may develop a feathery appearance.
Triple phosphate crystals are birefringent under polarized light.
They have no clinical significance; however, they are often seen in highly alkaline urine associated with the presence of urea-splitting bacteria.
triple phosphate- coffin’s lid
Triple phosphate
triple phosphate with amorphous phosphate
prisms with 6 sided
triple phosphate with graylish color
T.P. mistaken with calcium oxalate
Triple phosphate under polarized microscope
