Microscopic Examination of Urine

This set of flashcards focuses on key vocabulary and concepts related to microscopy techniques and urine examination.

Birefringence

The optical property of a material that causes the refractive index to change depending on the direction of light propagating through it.

Positive Birefringence

Describes a substance that rotates the plane of polarized light in a clockwise direction.

Negative Birefringence

Describes a substance that rotates the plane of polarized light in a counterclockwise direction.

Crossed Configuration

The arrangement in which two polarizing filters are placed at a 90-degree angle to each other, allowing only light rotated by birefringent substances to pass through.

Interference-Contrast Microscopy

A microscopy technique that provides a three-dimensional image by comparing light interference from different depths within the specimen.

Modulation Contrast (Hoffman)

A type of interference-contrast microscopy that involves a specific setup of polarizers and apertures to enhance contrast.

Differential Interference-Contrast Microscopy (Nomarski)

Uses birefringent prisms to split light beams for a detailed observation of specimen structural differences.

Dark-Field Microscopy

A microscopy technique that enhances the visibility of specimens by illuminating them at oblique angles, causing them to scatter light and appear bright against a dark background.

Fluorescence Microscopy

A technique that utilizes fluorescent substances to detect specific components in specimens by emitting light of a longer wavelength when excited by a particular wavelength.

Polarized Microscopy

A microscopy technique that uses polarized light to enhance the visibility of birefringent structures within a specimen.

Red Compensated Polarizing Filter

An additional filter that can be used in microscopy to help differentiate birefringent crystals by enhancing color visibility.

Oval Fat Bodies

Lipid-containing renal tubular epithelial cells that absorb lipids from the glomerular filtrate, appearing highly refractile.

Dysmorphic Red Blood Cells (RBCs)

Red blood cells with abnormal shapes associated with glomerular membrane damage.

Glitter Cells

Neutrophils that appear sparkling due to the Brownian motion of granules in hypotonic urine.

Epithelial Cells

Cells that line the urinary tract and may slough off into the urine; their presence can indicate various pathological conditions.

Hyaline Casts

Cast formed in the renal tubules, primarily made of uromodulin, that can be normal or indicate pathological conditions.

Waxy Casts

Casts associated with chronic renal failure characterized by a brittle, highly refractile matrix.

Broad Casts

Casts that are wider than usual, indicating significant renal impairment or severe urine stasis.

Crystals in Urine

Solid structures formed by the precipitation of urine solutes, which can provide important diagnostic information.

Calcium Oxalate Crystals

Common urine crystals seen in both acidic and neutral urine, with characteristic shapes.

Triple Phosphate Crystals

Crystals that appear in alkaline urine with a characteristic