p50, Blood

Department

Core Biochemistry

Delphic Registration Code

P50

Synonyms

Haemoglobin P50
Partial pressure of O2 at which Hb O2 saturation is 50%

Turnaround Time

2 hours

Test Code

4713

Specimen Type

• blood_gas_syringe

Specimen Requirements

Tube/Container Type:

Preferred

• Syringe

Paediatric Specimen Requirements

Tube/Container Type:

Preferred

• Syringe

Additional Specimen Information

Patient Specimen - Venous whole blood, in blood gas syringe

Aliquot Instructions

Sample Type

• Whole Blood

Minimum Volume (ml)

1.0

Transport to Lab

Chilled (2 - 8 degrees Celsius)

Interpretation

A low p50 indicates increased oxygen Hb affinity.
A high p50 reflects a decreased oxygen Hb affinity.
Changes in p50 are in indirect measure of the 2,3, dPG concentration.

Reference Intervals

22 – 27 mmHg

Test Method

Blood gas analyser: calculated from standard conditions - pH 7.40, pCO2 40 mmHg, temp 37°C.

The p50 is a measure of the oxyhaemoglobin binding characteristics identifying the position of the oxygen haemoglobin dissociation curve at half saturation (SO2 = 50%).

Non-Funded Test Cost

$24.5 (Exclusive of GST)

Billing Code

4713

Contact Information

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