The phosphorus blood test measures the amount of phosphate in the blood. Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand. A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe.

SPECIMEN: 2 mL (1 mL min.) serum from 1 SST. Ship refrigerated or frozen. Overnight fasting is preferred.
STABILITY: Room: 8 hrs; Refrigerated: 4 days; Frozen: 4 weeks
REPORT: Daily
INSTRUCTIONS: Overnight fasting is preferred.
USAGE: Phosphorus is a critical anion found mostly in bone and muscle. Multiple disorders specially affecting renal function can alter the phosphorus levels.