Microscopic Hematuria: Definition: Microscopic hematuria is the presence of red blood cells (RBCs) in the urine that is not visible to the naked eye. It is detected only through urinalysis or microscopic examination. Diagnostic Criteria: ≥3 RBCs per high-power field (HPF) on microscopic examination of a properly collected urine sample. Causes: Benign Causes: Vigorous exercise, menstrual contamination, urinary tract infections (UTIs), or recent catheterization. Pathological Causes: Kidney stones, glomerular diseases (e.g., IgA nephropathy), bladder or kidney cancer, or benign prostatic hyperplasia (BPH). Clinical Significance: Microscopic hematuria is often asymptomatic and may be detected incidentally during routine checkups. It requires further evaluation to rule out serious underlying conditions, especially in high-risk patients (e.g., smokers, older adults). Evaluation: Urinalysis: To confirm hematuria and check for other abnormalities (e.g., proteinuria, pyuria). Urine Cytology: To detect abnormal cells (e.g., in bladder cancer). Imaging: CT Urogram: Gold standard for evaluating the upper urinary tract (kidneys and ureters). Ultrasound: Alternative for patients who cannot undergo CT (e.g., pregnant women, renal impairment). Cystoscopy: To evaluate the bladder and urethra, especially in patients at risk for bladder cancer. Macroscopic Hematuria (Gross Hematuria): Definition: Macroscopic hematuria is the presence of visible blood in the urine, giving it a red, pink, or cola-colored appearance. Diagnostic Criteria: Blood in the urine is visible without magnification. Causes: Common Causes: Kidney stones, UTIs, trauma, or bladder/prostate cancer. Less Common Causes: Glomerular diseases (e.g., glomerulonephritis), bleeding disorders, or strenuous exe