The answer is a- >3.0 g/dL. Malignant pleural effusion is a condition where cancer cells spread to the pleural space, which is the area between the lungs and the chest wall. This condition can cause fluid buildup in the pleural space, which is known as pleural effusion. The fluid that accumulates in the pleural space can be analyzed to determine the underlying cause of the effusion.

One of the parameters that is measured in pleural fluid analysis is the total protein concentration. In malignant pleural effusion, the total protein concentration is usually elevated, with levels greater than 3.0 g/dL. This is because cancer cells release proteins into the pleural space, leading to an increase in total protein concentration.

For example, a study conducted by Porcel et al. (2015) found that the mean total protein concentration in malignant pleural effusion was 4.9 g/dL, which was significantly higher than the mean total protein concentration in non-malignant pleural effusion (3.3 g/dL). Another study by Chatterjee et al. (2017) also reported that the total protein concentration in malignant pleural effusion was significantly higher than in non-malignant effusion.

In summary, the total protein concentration in malignant pleural effusion is usually elevated, with levels greater than 3.0 g/dL. This parameter is important in the diagnosis and management of patients with pleural effusion.