What is the fluid weight gained between treatments for Linda if her pre-weight is 58 kg and her target weight is 55 kg?

To determine the fluid weight gained between treatments for Linda, the key is to first evaluate her pre-weight and target weight. Linda's pre-weight is 58 kg, which indicates the weight she measured just before undergoing treatment. Her target weight, on the other hand, is 55 kg, representing the ideal weight she should be at for stable treatment.

The fluid weight gained can be calculated by subtracting her target weight from her pre-weight:

Fluid weight gained = Pre-weight - Target weight

Fluid weight gained = 58 kg - 55 kg

Fluid weight gained = 3 kg

This calculation indicates that Linda has gained 3 kg of fluid weight since her last treatment, as she is currently weighing more than her target weight. Therefore, the correct choice reflects the amount of fluid weight gained during the period before her next treatment.