According to the Rule of Nines, what percentage of total body surface area (TBSA) is represented by the surface of one hand (including palm and fingers)?

Appeared in: NORCET 5 Prelims - Sept 2023 (Shift-2)

Explanation

1%, which is based on the 'Palm Method' for estimating burn size.
This method states that the surface area of a patient's own hand, including the palm and fingers, is approximately equal to 1% of their Total Body Surface Area (TBSA).
While the question mentions the 'Rule of Nines,' the Palm Method is the standard for estimating small areas like the hand and is used as a complementary tool to the Rule of Nines.

Option A: 9% represents the TBSA for an entire arm (from shoulder to fingertips) or the entire head and neck in an adult, not just the hand.
Option B: 18% represents the TBSA for an entire leg, the anterior trunk (chest and abdomen), or the posterior trunk (back) in an adult.
Option D: 10% is not a standard value used in the Rule of Nines or any other common TBSA estimation method.

Visual 1: Infographic - A diagram illustrating the 'Rule of Nines' on an adult human figure, showing the breakdown of percentages for each body part (head 9%, each arm 9%, each leg 18%, anterior/posterior trunk 18% each, perineum 1%).
Visual 2: Diagram - An illustration comparing the size of a hand to a body, with a label indicating 'Patient's hand = 1% TBSA' to explain the Palm Method.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Estimation of Total Body Surface Area (TBSA) in burn patients using the Rule of Nines and Palm Method as background academic context rather than a clinical decision trigger.
Accurate TBSA estimation is critical for calculating fluid resuscitation needs, most commonly using the Parkland formula (4 mL x body weight in kg x %TBSA). Underestimation can lead to shock, while overestimation can cause fluid overload and pulmonary edema.
The TBSA percentage determines the severity of the burn and guides treatment decisions, including whether the patient needs to be transferred to a specialized burn center (typically for burns >10-20% TBSA in adults).
What if? - If the patient were a child, the standard 'Rule of Nines' would be inaccurate due to different body proportions (larger head, smaller limbs). The Lund-Browder chart would be the preferred method for a more precise TBSA calculation in pediatrics, although the 1% palm method remains a useful tool.

How to Approach the Question

First, identify the key terms in the question: 'Rule of Nines,' 'TBSA,' and 'surface of one hand.'
Recall the standard percentages for the Rule of Nines in an adult: head (9%), each arm (9%), each leg (18%), trunk (36%), perineum (1%).
Recognize that the Rule of Nines is for large body sections. For a small, specific area like the hand, another principle is used.
Recall the 'Palm Method,' which is a complementary tool used for smaller or patchy burns.
Apply the Palm Method: the patient's hand (including fingers) is approximately 1% of their TBSA.
Select the option that matches this principle, which is 1%.

Concept Tested & Keywords

Concept Tested: Estimation of Total Body Surface Area (TBSA) in burn patients using the Rule of Nines and Palm Method.
Stem keywords: Rule of Nines, Total Body Surface Area, TBSA, hand
Lead-in keywords: what percentage

q7m-pEi0JtgUFz6-_xbXg

Practise the full NORCET 5 Prelims - Sept 2023 (Shift-2)

Attempt every question from this paper in a timed mock, then review the full solution for each one.