This question-specific review guide is tied to the answer reasoning for a PracticeTestVault item. Use it after you answer the question so the review stays focused on what the prompt actually tested.
What this question is testing
Objective: Antibody Identification
Prompt focus: An antibody panel shows that the patient serum reacts only with cells positive for the K antigen, and the reactions are strongest at the antiglobulin phase. Enzyme-treated panel cells do not change the reactivity. Which antibody is most consistent with this pattern?
Why the correct answer works
Anti-K
Reactivity restricted to K-positive cells at the antiglobulin phase, unchanged by enzymes, identifies anti-K.
Why the tempting wrong answer fails
The tempting wrong answer usually loses because it skips the key condition, priority, or evidence in the prompt.
Plain-language takeaway
Anti-K is a Kell system antibody that reacts best at the antiglobulin phase and is clinically significant. Kell antigens are resistant to common proteolytic enzymes, so enzyme treatment does not alter the reactions.
Simple analogy
Think of antibody identification like following a short checklist: identify the clue, confirm the rule, and then make the move that fits this exact scenario.
How to review it before a retake
- Underline the command word and name what the question is asking before rereading the choices.
- Compare the correct answer against the closest distractor and write the exact detail that separates them.
- Retest this objective with a fresh question without looking at the rationale first.