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Calcium Oxalate Stone (Detailed)

The most common type of urinary tract stone, accounting for 70-80% of urinary stones.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Üroloji department. Book Appointment →

What is Calcium Oxalate Stone (Detailed)?

Calcium oxalate stones (CaOx) are the most common type of urinary tract stones, accounting for 70-80% of all urinary stones; they are seen in two forms, monohydrate (whewellite, hard) and dihydrate (weddellite, more fragile). Stones develop in supersaturated urine due to hypercalciuria, hyperoxaluria, hypocitraturia, hyperuricosuria, and low urine volume.

Risk factors include genetic predisposition, low water intake (<2 L/day), high salt diet, animal protein, oxalate-rich foods (spinach, nuts, chocolate, tea), bowel diseases (Crohn's, gastric bypass), primary hyperparathyroidism, distal renal tubular acidosis, idiopathic hypercalciuria, and primary hyperoxaluria. Lifetime stone disease prevalence is 10-15%, recurrence rate is 50% within 5 years.

Diagnosis includes contrast-enhanced CT (gold standard), ultrasonography, X-ray (calcium stones are radiopaque), 24-hour urine analysis (calcium, oxalate, citrate, uric acid, sodium, magnesium, volume, pH), and metabolic evaluation (PTH, vitamin D, electrolytes). Treatment includes acute pain (NSAIDs), hydration, alpha-blocker for medical expulsive therapy, ESWL, ureteroscopy, PCNL; long-term protection with hydration, diet, thiazide, potassium citrate.

Symptoms

Severe flank pain (renal colic) - intermittent
Pain radiating to groin, testicle, labia
Hematuria (gross or microscopic)
Nausea, vomiting
Burning urination, frequency
Sometimes fever (with infection)
Inability to find a comfortable position
Cold sweating
Distal pain (descended stone)

Risk Factors

Family history of stone disease
Insufficient water intake (<2 L/day)
High salt diet (>5 g/day)
Excess animal protein (>1.2 g/kg)
Oxalate-rich diet (spinach, rhubarb, nuts, chocolate, tea)
Hot climate, occupations with sweating
Recurrent UTIs
Primary hyperparathyroidism
Distal RTA
Crohn's disease, ileal resection (enteric hyperoxaluria)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Severe flank pain not responding to oral analgesics
  • Hematuria
  • Pain accompanied by fever (urgency - obstruction + infection)
  • Urinary obstruction (anuria, oliguria)
  • Nausea-vomiting impairing oral intake
  • Stone history with sudden recurrent attacks
  • Pain accompanied by burning urination, frequency

Treatment Methods

01
Acute attack: NSAIDs (diclofenac, ketorolac), opioids if needed
02
Hydration (3-4 L/day urine output target)
03
Alpha-blocker (tamsulosin) - medical expulsive therapy
04
Stones <5 mm: 80% spontaneous passage
05
Stones 5-10 mm: ESWL or ureteroscopy
06
Stones >2 cm or staghorn: PCNL
07
Long-term: hydration, low salt-low animal protein diet
08
Adequate calcium intake (1000-1200 mg/day)
09
Potassium citrate 30-60 mEq/day
10
Thiazide diuretic (hydrochlorothiazide) - reduces hypercalciuria
11
Allopurinol (hyperuricosuria)
12
Annual 24-hour urine follow-up

Which Department to Visit?

You can visit our Üroloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.