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Hyperoxaluria is an excessive urinary excretion of oxalate. Individuals with hyperoxaluria often have calcium oxalate kidney stones. It is sometimes called Bird's disease, after Golding Bird, who first described the condition.
Many plants accumulate calcium oxalate as it has been reported in more than 1000 different genera of plants. [7] The calcium oxalate accumulation is linked to the detoxification of calcium (Ca 2+) in the plant. [8] Upon decomposition, the calcium oxalate is oxidised by bacteria, fungi, or wildfire to produce the soil nutrient calcium carbonate. [9]
[25] [53] Factors that promote the precipitation of oxalate crystals in the urine, such as primary hyperoxaluria, are associated with the development of calcium oxalate stones. [24] The formation of calcium phosphate stones is associated with conditions such as hyperparathyroidism [23] and renal tubular acidosis. [74]
Crystals that can be found in normal urine include uric acid, monosodium urate, triple phosphate (ammonium magnesium phosphate), calcium oxalate, and calcium carbonate. [124] Crystals can also appear as poorly defined aggregates of granular material, termed amorphous urates or amorphous phosphates (urates form in acid urine while phosphates ...
Nephrocalcinosis is connected with conditions that cause hypercalcaemia, hyperphosphatemia, and the increased excretion of calcium, phosphate, and/or oxalate in the urine. A high urine pH can lead to nephrocalcinosis but only if it is accompanied by hypercalciuria and hypocitraturia , since having a normal urinary citrate usually inhibits the ...
Urine microscopy can reveal needle or envelope-shaped calcium oxalate crystals in the urine which can suggest poisoning; although these crystals may not be present until the late stages of poisoning. [29] Finally, many commercial radiator antifreeze products have fluorescein added to enable radiator leaks to be detected using a Wood's lamp.
In kidney stones, calcium oxalate is the most common mineral type (see nephrolithiasis). Uric acid is the second most common mineral type, but an in vitro study showed uric acid stones and crystals can promote the formation of calcium oxalate stones. [1]
In urine tests, patients are given a week of restricted calcium diet, and their urine samples are collected for two days to assay calcium in the urine. Urine tests with hypercalciuria should result in a 0.2 mg/mg ratio between calcium and creatinine. If calcium excreted in urine is measured to be lower than 0.07 mmol/kg after 24 hours, diet ...