Australian Polyclinic · DHA Phase 5, Lahore
Arterial Blood Gas (ABG) Test in Lahore
A closer look at oxygen, carbon dioxide and your blood’s acid–base balance.
Understand why your doctor may request an ABG, what the test involves and how it fits into your respiratory assessment.
Medically reviewed and approved by Dr Ghulam Sarwar, Consultant Respiratory and Sleep Physician. Last reviewed: .
What is an ABG test?
An arterial blood gas test analyses a small blood sample from an artery, usually at the wrist. It measures oxygen pressure (PaO₂), carbon dioxide pressure (PaCO₂) and pH. Bicarbonate is usually calculated and helps interpret acid–base balance.
ABG complements pulmonary function testing: breathing tests assess airflow and lung function, while ABG assesses gases in arterial blood.
When might your doctor request it?
Low oxygen
To investigate impaired oxygenation or assess oxygen treatment.
Suspected CO₂ retention
When reduced ventilation may be causing carbon dioxide to build up.
Acid–base disturbance
To help assess respiratory, kidney or metabolic problems affecting blood pH.
ABG and a finger oxygen monitor: the difference
A pulse oximeter estimates oxygen saturation without a needle. It does not measure carbon dioxide or blood pH. A reassuring finger reading therefore cannot exclude CO₂ retention. ABG can provide the extra information needed for treatment decisions.
For oxygen monitoring during sleep, read about overnight oximetry. This answers a different question and does not replace ABG when CO₂ or pH assessment is required.
Preparing for your test
- Bring your referral, previous results and medication list.
- Tell the team about blood thinners, bleeding problems and allergies.
- Follow the clinic’s preparation instructions. Do not stop medicines yourself.
- If you use oxygen, keep it at the prescribed setting unless your clinician directs otherwise. The oxygen setting at sampling must be recorded.
What happens during and after sampling?
- The clinician checks the sampling site and circulation, then cleans the skin.
- A small arterial sample is collected. This may feel more uncomfortable than a routine blood test; local anaesthetic may be used.
- Firm pressure is applied until bleeding stops—usually at least five minutes, and longer when needed.
Bruising or soreness can occur. Serious complications are uncommon. Follow the team’s aftercare advice and seek prompt medical help for persistent bleeding, increasing swelling, severe pain, or a cold, pale or numb hand.
Understanding the main results
| Parameter | Typical range | What it helps assess |
|---|---|---|
| pH | 7.35–7.45 | Acidity or alkalinity |
| PaCO₂ | 35–45 mmHg | Carbon dioxide removal |
| PaO₂ | 75–100 mmHg | Oxygenation on room air, near sea level |
| Bicarbonate (HCO₃⁻) | 22–26 mmol/L | Acid–base balance |
Interpretation depends on age, altitude, oxygen therapy and clinical circumstances. A single abnormal result does not establish a diagnosis. Your doctor interprets the values together.
Common questions
Can ABG help decide whether I need home oxygen?
Yes. It may contribute to an assessment, but oxygen prescriptions depend on your condition and the full clinical evaluation. Do not start, stop or adjust oxygen based on one number yourself.
Does every analyser measure electrolytes and lactate?
No. Additional measurements depend on the analyser and requested panel. Ask which parameters are included.
What does an ABG test cost in Lahore?
Contact Australian Polyclinic for current availability, the fee, preparation requirements and reporting arrangements before travelling.
Your next step
Discuss your ABG referral
Contact our team to confirm testing arrangements and whether a respiratory consultation is appropriate.
Australian Polyclinic
Building 19, CCA, DHA Phase 5, Lahore
0311 0573333
Severe breathlessness, blue lips, new confusion or marked drowsiness require urgent hospital assessment. Do not wait for an outpatient appointment.