Urinary Symptoms and Lower Urinary Tract Disorders
Urinary Symptoms and Lower Urinary Tract Disorders - Approach to urine color changes, urinary retention, nocturia, LUTS and urinary incontinence.
Practical orientation: Urinary symptoms are not always renal. Separate urine color, storage/voiding symptoms, retention and incontinence before ordering extensive kidney workup.
Urine color and appearance
| Appearance | Consider |
|---|---|
| Red, smoky brown or cola-colored | Glomerular hematuria. If no RBCs, consider myoglobinuria or hemoglobinuria. |
| Bright red or pink | Nonglomerular hematuria; foods or medications can mimic. |
| Brown | Drugs, alkaptonuria or bilirubin-related disease. |
| Orange | Bilirubin or medication effect. |
| Green/blue | Medications, propofol or Pseudomonas UTI. |
| Purple | Porphyria or purple urine bag syndrome. |
| Turbid/milky | WBCs, bacteria, fungi, chyluria or crystals. |
| Foamy | Heavy albuminuria or bilirubin. |
Reduced urine output
| Term | Definition / meaning |
|---|---|
| Oliguria | Often <400-500 mL/day, or AKI staging thresholds by mL/kg/hr. |
| Anuria | <100 mL/day; consider severe shock, RPGN, renal infarction or bilateral obstruction. |
| Nonoliguric AKI | Significant kidney injury with preserved urine output; do not rely on urine output alone. |
Urinary retention
| Domain | Practical points |
|---|---|
| Definition | Inability to voluntarily pass urine; chronic retention often defined by persistent post-void residual >300 mL. |
| Common causes | BPH, prostate cancer, urethral stricture, stones, clots, constipation, pelvic organ prolapse, neurogenic bladder. |
| Drugs | Antimuscarinics, antihistamines, antipsychotics, tricyclics, antiparkinsonian drugs, muscle relaxants, sympathomimetics. |
| Workup | Bladder scan, renal/bladder ultrasound, BMP, urinalysis and culture. |
| Treatment | Catheterization; monitor post-obstructive diuresis and hypernatremia. |
Nocturia
| Cause category | Examples |
|---|---|
| Global polyuria | Diabetes mellitus, diabetes insipidus, primary polydipsia. |
| Nocturnal polyuria | CKD, nephrotic syndrome, cirrhosis, heart failure, evening fluids/diuretics, sleep apnea. |
| Low bladder capacity | BPH, cystitis, bladder wall disease, overactive bladder. |
Management includes avoiding evening fluids/caffeine/alcohol, moving diuretics earlier, treating sleep apnea, and selected desmopressin use with sodium monitoring.
LUTS
| Type | Symptoms | Treatment concepts |
|---|---|---|
| Obstructive | Incomplete emptying, weak stream, hesitancy, intermittency, straining, terminal dribbling. | Alpha-1 blockers; evaluate obstruction and malignancy risk. |
| Storage | Frequency, nocturia, urgency, urge incontinence, bladder pain. | Treat infection/irritation; bladder training; antimuscarinic or beta-3 agonist when appropriate. |
Urinary incontinence
| Type | Pattern | Treatment concepts |
|---|---|---|
| Stress | Small volume leakage with exertion, cough, sneeze or laugh. | Pelvic floor muscle training, weight loss, selected surgery. |
| Urge | Larger volume, urgency and frequency day and night. | Bladder training, antimuscarinics, mirabegron. |
| Overflow | Incomplete emptying from underactive bladder and/or outlet obstruction. | Check post-void residual and treat retention/obstruction. |