Which of the following characteristics indicates protein deficiency in a client?

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018

Explanation

Negative nitrogen balance occurs when the body's nitrogen output exceeds its nitrogen intake.
Since nitrogen is a core component of amino acids, the building blocks of protein, a negative balance directly indicates that the body is breaking down its own protein stores (catabolism) for fuel.
This catabolic state is a hallmark of inadequate protein intake, starvation, or significant physiological stress like major infections or trauma.

Option A: Spoon-shaped nails, or koilonychia, are a classic physical sign of iron-deficiency anemia.
Option B: Increased bleeding time is primarily associated with impaired blood clotting, which can result from platelet disorders or a deficiency in vitamin K-dependent clotting factors.
Option D: Positive nitrogen balance signifies an anabolic state where protein synthesis exceeds protein breakdown, which is the opposite of protein deficiency.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Assessment of Nutritional Status as background academic context rather than a clinical decision trigger.
Assessing nutritional status is a fundamental nursing role. Protein deficiency can delay wound healing, impair immune function, and increase the risk of infections, especially in post-operative, elderly, or critically ill patients.
Nurses monitor for signs of protein deficiency by tracking dietary intake, weight, and serum albumin levels, and observing for physical signs like muscle wasting and edema.
What if? If a patient has a negative nitrogen balance but their weight is increasing, the nurse should assess for edema. Fluid retention can mask true tissue loss (wasting), a condition common in kwashiorkor-like malnutrition where low plasma protein levels cause fluid to shift into the interstitial space.

How to Approach the Question

First, identify the key concept in the question stem: a characteristic sign of 'protein deficiency'.
Next, analyze each option to understand its physiological meaning.
Focus on the term 'nitrogen balance'. Recall that nitrogen is the defining element of protein. Therefore, its balance is a direct measure of protein metabolism.
Differentiate between 'negative' and 'positive' balance. 'Negative' implies a loss or deficit, which aligns with a deficiency. 'Positive' implies a gain or surplus.
Evaluate the other options. 'Spoon shaped nails' is a classic sign of iron deficiency. 'Increased bleeding time' relates to clotting factors/platelets. This process of elimination confirms that negative nitrogen balance is the most direct and accurate indicator of protein deficiency among the choices.

Concept Tested & Keywords

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E6 Harper's Illustrated Biochemistry2023 (pp 26-793 of 813) p. 517-519

E6 Medicine Davidson Principles Practice 24e p. 712-714

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