A CT KUB is a noninvasive computed tomography scan of the kidneys, ureters and bladder used to detect kidney stones, urinary tract obstruction, masses, infections and anatomical abnormalities. Non-contrast CT is commonly used for stones; contrast may be added for suspected tumors or infection. It provides rapid, detailed cross-sectional images but involves ionizing radiation and sometimes contrast-related risks; brief preparation may be required.

A CT KUB is generally not painful. The scan is noninvasive; you lie on a table while images are taken. You may feel minor discomfort from lying still, a brief sting if intravenous contrast is used, or pressure if asked to hold a full bladder. Anxiety or claustrophobia can cause discomfort. Report any severe pain or adverse reactions to staff immediately.

CT KUB costs vary widely by country, facility and whether contrast is used. Typical private prices: India roughly ₹2,000–₹10,000; UK private roughly £150–£500 (publicly funded care is free for eligible patients); United States roughly $300–$3,000 out‑of‑pocket before insurance. Final price depends on location, facility, urgent reporting, and insurance—check with your provider or insurer for exact charges.

CT‑KUB (usually non‑contrast) is designed to detect stones and urinary tract anatomy. It can show indirect signs of infection—renal enlargement, perinephric fat stranding, gas or fluid collections suggesting abscess—but is less sensitive for uncomplicated cystitis or early pyelonephritis. Contrast-enhanced CT or ultrasound are preferred when active renal infection or abscess is suspected; correlate with clinical findings, urinalysis and cultures.

No — a non-contrast CT KUB (commonly done for kidney stones) usually does not require fasting; you can eat normally. If an IV contrast-enhanced CT is planned, you’ll typically be asked to fast for about 4–6 hours and follow other prep (e.g., medication or kidney function checks). Some centers may request drinking or emptying the bladder—follow the imaging center’s instructions.

A CT KUB (non-contrast CT of kidneys, ureters and bladder) can sometimes incidentally reveal renal or pelvic masses, but it’s designed mainly to detect stones. Its lack of contrast limits sensitivity for small or soft-tissue tumours and for lesion characterization. If a mass is suspected or seen, contrast-enhanced CT, MRI or ultrasound and specialist assessment are usually recommended for definitive evaluation.