Phosphate (serum)

 

Alternative names, keywords

PO4

Samples required

● Clotted blood (gold cap, 5 mL tube). Smaller tubes are available for paediatric samples.

Avoid haemolysis.

Samples received more than 8 hours after venepuncture are unsuitable for analysis.

Test indications

  

Factors affecting test performance/ results

Haemolysis releases phosphatases and organic phosphates from red cells, leading to an increase in inorganic phosphates.

Phospholipids contained in liposomal drug formulations (e.g. AmBisome) may be hydrolysed in the test due to the acidic reaction pH and thus lead to elevated phosphate results.

In very rare cases, gammopathy, in particular type IgM (Waldenström’s macroglobulinemia), may cause unreliable results.

Results should always be assessed in conjunction with the patient’s medical history, clinical examination and other findings.

Reference range

adult: 0.81 - 1.45 mmol/L

paediatric (mmol/L):

 

Male

 Female

1 to 30 days

 1.25 - 2.25 1.40 - 2.50

1 to 12 months

 1.15 - 2.15 1.20 - 2.10

1 to 3 years

 1.00 - 1.95 1.10 - 1.95

4 to 6 years

 1.05 - 1.80 1.05 - 1.80

7 to 9 years

 0.95 - 1.75 1.00 - 1.80

10 to 12 years

 1.05 - 1.85 1.05 - 1.70

13 to 15 years

 0.95 - 1.65 0.90 - 1.55

16 to 18 years

 0.85 - 1.60 0.80 - 1.55


Source: Roche Cobas® Phosphate kit insert 2023-10, V14.0

Turnaround time

Same day (within 1h if urgent)

Enquiries

Biochemistry (Automation)

 

Details