Full formMedical & Health
PAO2stands forPartial Pressure of Oxygen in Arterial Blood
Full Form of PAO2
What is PAO2?
PAO2, or partial pressure of oxygen in arterial blood, is a critical parameter measured during an arterial blood gas (ABG) test. It indicates how well oxygen is moving from the lungs into the bloodstream. In India, PAO2 is routinely monitored in intensive care units, emergency departments, and during surgeries to assess respiratory efficiency and diagnose conditions such as hypoxemia, ARDS, or COPD. The normal reference range for PAO2 is 80–100 mmHg, though it varies with altitude and age. Clinicians use PAO2 alongside PaCO2 and pH to evaluate gas exchange and acid-base balance. In the Indian healthcare context, ABG analyzers are available in major hospitals, and PAO2 values guide decisions on oxygen therapy, mechanical ventilation, and management of respiratory failure. For medical students preparing for NEET PG or MBBS exams, understanding PAO2 is essential, as questions frequently appear on its interpretation and clinical significance. It is also relevant for nursing and paramedical professionals. PAO2 should not be confused with SpO2 (peripheral oxygen saturation), which is a non-invasive estimate. Accurate PAO2 measurement requires proper sample collection and handling, making it a vital tool in critical care medicine across India.
PAO2 का फुल फॉर्म
धमनी रक्त में ऑक्सीजन का आंशिक दबाव
Example
The ABG report showed a low PAO2 of 55 mmHg, prompting the doctor to start the patient on oxygen therapy immediately.
PAO2 — frequently asked questions
What is the full form of PAO2?
PAO2 stands for Partial Pressure of Oxygen in Arterial Blood.
What is the normal range of PAO2 in a healthy person?
The normal PAO2 range is 80–100 mmHg, but it can be lower at high altitudes or in elderly individuals.
How is PAO2 different from SpO2?
PAO2 is the actual pressure of oxygen dissolved in arterial blood measured via ABG, while SpO2 is an estimate of oxygen saturation obtained non-invasively using a pulse oximeter.