What is the colour of anti-sera, Anti A used in blood group testing?

Appeared in: DSSSB 6 September 2024

Explanation

To prevent procedural errors during blood typing, commercial antisera are color-coded as a safety standard.
Anti-A antiserum is universally colored blue, which is typically achieved by adding methylene blue dye.
This standardization helps laboratory technicians quickly and accurately identify the correct reagent, which is crucial for patient safety before procedures like blood transfusion.

Option A: Red is not a standard color for any of the primary ABO or Rh antisera. The red color in blood samples comes from hemoglobin within the red blood cells themselves, not the testing reagents.
Option B: Antisera are clear liquid solutions, not white or opaque. If a reagent appears cloudy or white, it may indicate contamination, precipitation, or degradation, and it should not be used.
Option C: Yellow is the standard color code for Anti-B antiserum, which is used to detect the B antigen on red blood cells. The dye used is typically acriflavin.

Clinical Relevance

Nursing practice connection: Knowing Color coding of blood grouping antisera helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
The color-coding of antisera is a critical safety feature in blood banking and laboratory medicine to prevent life-threatening ABO-incompatible blood transfusions.
Nurses must be aware of this standard, especially when assisting with or performing point-of-care or emergency blood typing, to ensure the correct reagents are used.
What if? If the reagents were not color-coded, the risk of human error would increase significantly. A tired or distracted technician could easily mix up the clear liquids, leading to a mis-typed blood group and a potentially fatal transfusion reaction.

How to Approach the Question

This is a factual recall question based on standard laboratory safety procedures.
First, identify the specific reagent in question: 'Anti-A' antisera.
Recall the international color-coding system for blood typing reagents.
Mentally associate 'Anti-A' with the color 'Blue'.
Differentiate this from 'Anti-B', which is associated with 'Yellow'.
Scan the options and select the one that matches the recalled fact for Anti-A.

Concept Tested & Keywords

Q_CYzF-7RCwSjFfaarxIoF

E6 Pathology-Vandana Puri & Kavita Gaur Textbook of Pathology and Genetics p. 411-413

E6 Physiology Essentials Sembulingam 10e Part 1 p. 146-148

Practise the full DSSSB 6 September 2024

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