Nephrocalcinosis is a disorder in which there is too much calcium deposited in the kidneys. It is common in premature babies.
Any disorder that leads to high levels of calcium in the blood or urine may lead to nephrocalcinosis. In nephrocalcinosis, calcium deposits form in the kidney tissue itself. Most of the time, both kidneys are affected.
Nephrocalcinosis is related to, but not the same as, kidney stones (nephrolithiasis).
Conditions that can cause nephrocalcinosis include:
Other tests that may be done to diagnose and determine the severity of associated disorders include:
Blood tests to check levels of calcium, phosphate, uric acid, and parathyroid hormone
Urinalysis to see crystals and check for red blood cells
24-hour urine collection to measure acidity and levels of calcium, sodium, uric acid, oxalate, and citrate
The goal of treatment is to reduce symptoms and prevent more calcium from building up in the kidneys.
Treatment will involve methods to reduce abnormal levels of calcium, phosphate, and oxalate in the blood and urine. Options include making changes in your diet and taking medicines and supplements.
If you take medicine that causes calcium loss, your health care provider will most often tell you to stop taking it. Never stop taking any medicine before talking to your provider.
Other symptoms, including kidney stones, should be treated as is appropriate.
What to expect depends on the complications and cause of the disorder.
Proper treatment may help prevent further deposits in the kidneys. In most cases, there is no way to remove deposits that have already formed. Many deposits of calcium in the kidneys do NOT always mean severe damage to the kidneys.
Elder JS. Urinary lithiasis. In: Kliegman RM, Stanton BF, St Geme JW, Schor NF, eds. Nelson Textbook of Pediatrics. 20th ed. Philadelphia, PA: Elsevier; 2016:chap 547.
Jennifer Sobol, DO, urologist at the Michigan Institute of Urology, West Bloomfield, MI. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.