Test Details & Preparation

• Phosphorus testing is done to evaluate the level of phosphorus in your blood and to aid in the diagnosis of conditions known to cause abnormally high or low levels of phosphorus.


• Phosphorus testing is performed as a follow up to an abnormal calcium level when you have a kidney disorder or uncontrolled diabetes when you are taking calcium or phosphate supplements.


• A blood sample drawn from a vein in your arm or sometimes a timed urine collection (usually a 24-hour sample) for Phosphorus testing.


• Overnight fasting may be required for a blood sample follow any instructions given by your doctor.


• Low levels of phosphorus (hypophosphatemia) in the blood may be due to or associated with hyperparathyroidism, malnutrition, alcoholism, severe burns, chronic antacid use, etc.


• Higher than normal levels of phosphorus (hyperphosphatemia) in the blood may be due to or associated with kidney failure, liver disease, diabetic ketoacidosis, increased dietary intake, etc.


• Abnormally high levels of phosphorus can lead to organ damage due to calcification, deposits of calcium phosphate in the tissues. This is rare, however, and it is more common that high phosphorus levels lead to cardiovascular disease or osteoporosis.