Hypophosphatemia Hypophosphatemia is a disorder of phosphorus metabolism caused by a lower than normal concentration of phosphate in the circulating blood. Manifestations include hemolysis, lethargy, weakness, and convulsions. Causes include fasting, prolonged use of aluminum hydroxide, magnesium hydroxide or aluminum carbonate binding agents, glycolysis and alkalosis, hyperthyroidism, vitamin D deficiency, certain renal tubular diseases (e.g., Fanconi’s syndrome), alcoholism and anti-vitamin D rickets (familial hypophosphatemia). Clinical manifestations: 1. Central nervous system symptoms, such as abnormal sensation, dysarthria, hyperreflexia, tremor, ataxia, coma. 2.Red cell life span is shortened due to decreased erythrocyte 2,3-diphosphoglycerate, which may manifest spherocytosis and hemolysis. 3. Weakness, muscle weakness, muscle pain, and even paralysis. 4, bone pain (due to osteochondrosis), and pseudo-fractures visible on X-ray films. 4. Leukocyte phagocytosis dysfunction, susceptibility to infection. (6) Platelet dysfunction and reduced platelet aggregation ability. Differential diagnosis: The most frequent cause of hypophosphatemia is alkalosis (respiratory and metabolic). Usually hypophosphatemia can be differentiated by the following procedure: after first excluding the cause of alkalosis, urinary phosphate is measured. If urinary phosphate excretion is increased, plasma calcium is measured. If plasma calcium is normal or decreased, consider secondary hyperparathyroidism, rickets or osteomalacia, Fanconi’s syndrome, or hypophosphatemic chondromalacia. Hyperphosphatemia is an increase in blood phosphate levels above normal levels. Clinical manifestations: Hyperphosphatemia has no specific clinical symptoms. If hyperphosphatemia persists for too long, it can affect the stability of the internal environment of calcium; calcium-phosphorus binding can lead to ectopic calcification and can inhibit intestinal calcium absorption, resulting in lower blood calcium and manifesting hypocalcemia. Differential diagnosis: Before a definitive diagnosis can be made, hyperphosphatemia due to hemolysis of blood specimens must first be excluded. The differential is then performed according to the following procedures. 1. Check renal function. If renal function is normal, urinary phosphate excretion is measured. 2.Increased urinary phosphate excretion, consider increased phosphate intake, tumor destruction, or hyperphosphatemia after tumor treatment. 3, decreased urinary phosphate excretion, hypoparathyroidism should be considered. If the renal function is hypoparathyroid, consider hyperphosphatemia due to renal failure.