Imperial Collage Healthcare

Phosphate (blood)


Test Background
In primary hyperparathyroidism, serum phosphorus levels are abnormally low as a result of decreased renal tubular phosphorus reabsorption. This contrasts with secondary hyperparathyroidism, in which serum phosphorus levels are generally elevated because of renal disease.


Clinical Indications

  • Suspected disorders of bone
  • Diagnosis and monitoring of renal failure


Reference Range

Adult : 0.8-1.5 mmol/L
Up to 1 month : 1.25-2.6 mmol/L
1-12 months : 1.3-2.4 mmol/L
1-16 years : 0.9-1.8 mmol/L


Sample Required
SST (gold top)


Sample Volume
0.5 mL


Turnaround Time
1 day


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