# Before transfusion, the nurse compares the client record with the blood unit. Click the incompatible information on the unit.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=499744&lang=en  
> language: en  
> subject: Blood/Blood Products  
> category: PPT

## Question

Before transfusion, the nurse compares the client record with the blood unit. Click the incompatible information on the unit.

![](https://mymerci.kr/data/nclex/hotspot/v4/v4_transfusion_mismatch.svg)

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## Explanation

The client is B positive, but the red blood cell unit is labeled A positive. The ABO mismatch is incompatible, so the transfusion must not begin.

## In-depth explanation

Quick answer
The client is B positive, but the red blood cell unit is labeled A positive. The ABO mismatch is incompatible, so the transfusion must not begin.

Why this is correct
The client is B positive while the red-cell unit is A positive. This ABO mismatch is incompatible, so the transfusion must not begin.

Easy analogy or mental picture
Treat the client record and blood-unit label as two halves of one identity check; every required identifier and compatibility element must agree.

Memory hook
The A-positive red-cell unit is incompatible with the B-positive client record.

NCLEX decision rule
Immediately before transfusion, compare the client, order, compatibility record, and unit label using the required independent check.

Why the other choices are wrong
The unit identifier and verified client type are necessary checks, but the A-positive unit label is the incompatible element in this comparison.References

- [1]NCBI Bookshelf: Pretransfusion testing

## Clinical scenario

Clinical situation
Before transfusion, the nurse compares the client record with the blood unit.

What the nurse should notice
The client is B positive, but the red blood cell unit is labeled A positive. The ABO mismatch is incompatible, so the transfusion must not begin.

Transfer to practice
Immediately before transfusion, compare the client, order, compatibility record, and unit label using the required independent check.

## Key concepts

- **ABO compatibility** — Matching red-cell antigens with the recipient to prevent an acute hemolytic reaction.
- **Pretransfusion verification** — The final identity and compatibility check completed before blood administration.

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