Evidence-Based Supplement & Herb Guides

Urine Nitrite Test for UTI: Positive Result, Bacteria, and Infection Meaning

Understand urine nitrite test results for UTI, including what a positive or negative result means, which bacteria make nitrite, false negatives, and when culture is needed.

A urine nitrite test is a rapid dipstick test that can support the diagnosis of a bacterial urinary tract infection (UTI). A positive result...

Urine PCR Test for UTI: Bacterial DNA, Resistance Genes, and Result Meaning

Learn how urine PCR testing detects UTI bacterial DNA and resistance genes, how it compares with urine culture, and what positive, negative, or multi-organism results mean.

A urine PCR test for UTI uses molecular methods to detect bacterial DNA, and some panels also look for selected antibiotic resistance genes. Compared...

UTI Test Panel: Urinalysis, Urine Culture, Sensitivity, and Infection Markers

Understand a UTI test panel, including urinalysis, leukocyte esterase, nitrite, WBCs, urine culture, CFU colony count, and antibiotic susceptibility results.

A UTI test panel is not one universal laboratory package. It usually means a combination of tests used to decide whether a urinary tract...

White Blood Cells in Urine Test: Pyuria, UTI, Inflammation, and Meaning

Understand white blood cells in urine, pyuria ranges, UTI and sterile-pyuria causes, how WBCs relate to leukocyte esterase and nitrite, and when follow-up is needed.

White blood cells in urine are a sign of inflammation somewhere in the urinary tract, but they do not automatically mean a bacterial urinary...

Acanthocytes in Urine: Glomerular Kidney Disease and Hematuria Meaning

Acanthocytes in urine suggest glomerular bleeding. Learn what they mean, how they differ from other dysmorphic RBCs, and when hematuria needs kidney follow-up.

Acanthocytes in urine are abnormally shaped red blood cells that strongly suggest bleeding from the kidney’s glomeruli, the tiny filters that clean the blood....

Amorphous Crystals in Urine: Urates, Phosphates, pH, and Meaning

Amorphous crystals in urine are usually urates in acidic urine or phosphates in alkaline urine. Learn what they mean, how pH affects them, and when follow-up is needed.

Amorphous crystals in urine are tiny mineral precipitates that look like fine, shapeless granules under the microscope. The two common types are amorphous urates,...

Bacteria in Urine Microscopy: UTI, Contamination, Colony Count, and Culture Follow-Up

Bacteria in urine microscopy may mean UTI, contamination, or asymptomatic bacteriuria. Learn how pyuria, colony count, culture, and symptoms guide follow-up.

Bacteria seen on urine microscopy can support a urinary tract infection, but the finding does not prove that an infection is present. Bacteria may...

Bilirubin Crystals in Urine: Liver Disease Marker and Abnormal Urine Sediment

Bilirubin crystals in urine can signal conjugated bilirubin excretion from liver or bile-duct disease. Learn how they look, what tests confirm the cause, and when follow-up is urgent.

Bilirubin crystals in urine are an uncommon abnormal sediment finding that usually appears when conjugated bilirubin is being excreted in substantial amounts. Under the...

Broad Casts in Urine: Advanced Kidney Disease and Low Urine Flow

Broad casts in urine can reflect dilated tubules, low urine flow, and advanced kidney damage. Learn how broad waxy casts differ from other casts and what follow-up tests mean.

Broad casts in urine are unusually wide cylindrical structures formed inside enlarged or damaged kidney tubules and collecting ducts. They are an abnormal microscopy...

Calcium Oxalate Crystals in Urine: Kidney Stones, Causes, and Meaning

Calcium oxalate crystals are common and may occur without stones. Learn their shapes, causes, stone-risk meaning, 24-hour urine follow-up, and warning signs.

Calcium oxalate crystals are common urine crystals and are the mineral found in most kidney stones, but seeing them on microscopy does not mean...

Calcium Phosphate Crystals in Urine: Kidney Stones, Alkaline Urine, and Meaning

Calcium phosphate crystals in urine often reflect alkaline urine and may signal kidney stone risk. Learn the causes, pH link, testing, and prevention steps.

Calcium phosphate crystals in urine usually mean that the urine environment favors precipitation of calcium and phosphate, especially when urine pH is high. A...

Cholesterol Crystals in Urine: Nephrotic Syndrome and Heavy Proteinuria

Cholesterol crystals in urine can signal lipiduria from nephrotic syndrome and heavy proteinuria. Learn what they look like, causes, tests, and follow-up.

Cholesterol crystals in urine are an uncommon form of lipiduria and are most important when they appear with heavy protein loss from the kidneys....

Cystine Crystals in Urine: Cystinuria, Kidney Stones, and Genetic Risk

Cystine crystals in urine strongly suggest cystinuria and recurrent stone risk. Learn the genetic cause, testing, pH targets, treatment, and prevention.

Cystine crystals in urine are an important finding because their classic hexagonal shape strongly points to cystinuria, an inherited disorder that causes excess cystine...

Drug Crystals in Urine: Medication Crystals, Kidney Risk, and Microscopy Findings

Drug crystals in urine may reflect medication crystalluria or crystal-related kidney injury. Learn causes, microscopy patterns, kidney risks, and follow-up steps.

Drug crystals in urine are particles formed when a medication or one of its metabolites becomes concentrated enough to precipitate in the urinary tract....

Dysmorphic Red Blood Cells in Urine: Glomerular Hematuria and Kidney Filter Disease

Dysmorphic red blood cells in urine can point to glomerular hematuria. Learn what acanthocytes mean, common kidney causes, test limits, and follow-up.

Dysmorphic red blood cells in urine are abnormally shaped RBCs that can point to bleeding from the kidney’s glomeruli—the microscopic filters that normally keep...

Epithelial Cell Casts in Urine: Kidney Tubule Damage and Acute Tubular Injury

Epithelial cell casts in urine can signal kidney tubule damage and acute tubular injury. Learn causes, microscopy patterns, related casts, and follow-up.

Epithelial cell casts in urine are tube-shaped structures containing renal tubular epithelial cells. Because urinary casts form inside kidney tubules, an epithelial cell cast...