Hypoxemia is a medical condition defined as a lower-than-normal level of oxygen in the blood. It can be detected during a physical examination and is often a clinical sign of respiratory diseases such as pneumonia.

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Pneumonia is a condition in which the lungs fill with mucus. It is characterized by respiratory and systemic symptoms, including fever, congestion, cough, shortness of breath, and increasing aches and pains. Specific clinical signs observed during a physical examination include hypoxemia (a lower-than-normal level of oxygen in the blood), a crackling sound when breathing, the production of greenish sputum (mucus), and the appearance of a 'shadow' in the lung on a chest radiograph.

Clinical Signs of Pneumonia

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On a normal chest radiograph (X-ray), the ribs and other bones appear white, while healthy lungs appear as a smooth, even black color throughout. When a patient is suffering from pneumonia, the accumulation of fluid and mucus causes a significant white cloudiness, known as lung infiltrate, to appear in the otherwise black lung areas on the imaging.

Radiographic Appearance of Pneumonia

Hypoxemia

A pulse oximeter is a small medical diagnostic device that typically clips onto a patient's finger to measure their blood oxygen levels. It is commonly used to diagnose conditions like hypoxemia.

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