Fecal calcium

The amount of calcium excreted by the feces varies from diet to diet. Infants and young children, children and children are more likely to absorb more calcium during the growth and development period. Fecal calcium assays have been used as part of metabolic balance studies. Calcium promotes absorption in the small intestine with the participation of vitamin D. Fecal calcium assays have been used as metabolic balance studies. It is often measured by flame photometry in clinical practice. Basic Information Specialist classification: Digestive examination classification: feces / parasitic examination Applicable gender: whether men and women apply fasting: not fasting Tips: When measuring fecal calcium, patients should limit the high calcium diet. Hydrochloric acid should be added to the specimen collection, otherwise the measurement result is low. Normal value General diet, discharge <14mmol / d. Clinical significance Abnormal results: (1) Increase: Seen in vitamin D deficiency. Foods such as oats contain high levels of phytic acid and calcium phytate formed in the body is insoluble in water and excreted from the feces. Also seen in high phosphorus diet, kidney disease, hypoparathyroidism, fatty sputum and malnutrition syndrome (absorption disorder). (2) Reduction: It is seen in the successful treatment of patients with osteomalacia and vitamin D hyperthyroidism with vitamin D. Because the calcium absorbed by normal people is more, the fecal calcium is reduced. In patients with low levels of phosphate in food, calcium absorption is increased in some Boeck sarcoma patients, but cortisone treatment can reduce this increase. Need to check the crowd: Patients with signs of dysfunction. The result is low, may be disease: vitamin D deficiency, high disease result may be disease: vitamin D poisoning precautions Requirements for inspection: When measuring fecal calcium, patients should limit their high-calcium diet. Hydrochloric acid should be added to the specimen collection, otherwise the measurement result is low. Note before inspection: Intake of ammonium chloride, calcitonin, corticosteroids, growth hormone, parathyroid hormone and other drugs can increase urinary calcium. Intake of diuretics, estrogen, neomycin, oral contraceptives and other drugs can reduce urinary calcium. Not suitable for people: Non-invasive examination, there is no inappropriate population. Inspection process 1 In the morning of the test day, 42Ca, intravenous injection (0.5~1.2mgkg-1), and 10 minutes of injection. 2 Collect feces 10-14 days after injection. 3 Determination of calcium in feces by atomic absorption spectrometry. 4 The stable isotope calcium content in urine feces was measured by a mass spectrometer. 5 Calculation of endogenous fecal calcium (Vf), ie Vf (mgkg-1d-1) = Vu (mgkg-1d-1) × (∫t0 intravenously isotope in the amount of feces / ∫t0 intravenously injected isotopes in The amount in urine) u is the average value of daily urinary calcium during the experimental period, and t is the time at which the tracer accumulates non-progressive values. Not suitable for the crowd Generally no taboos. Adverse reactions and risks Generally not.