FISDAP EMT Practice Test 2026 – Comprehensive Exam Preparation

The situation described involves a 24 year old female with large blisters on her forearm as a result of exposure to drain cleaner, which is a caustic chemical. When evaluating the type of burn based on the presentation, the presence of large blisters indicates that the burn has penetrated through the outermost layer of the skin (epidermis) and into the second layer (dermis), which is characteristic of a partial thickness burn.

Partial thickness burns involve damage to both the epidermis and the dermis, leading to symptoms such as pain, swelling, and blistering. The blisters are a body's response to protect the underlying tissues and signify that the injury is more significant than a first degree burn, which affects only the epidermis and typically presents with redness and minor swelling without blistering.

Although a chemical burn is also involved here because the causative agent is a chemical substance, the classification of burns is based primarily on the depth and appearance of the skin damage. Therefore, the primary classification concerning the degree of skin injury in this case is a partial thickness burn due to the presence of large blisters.