Blood without corpuscles and fibrinogen is known as?

Appeared in: UP CHO - 2018

Explanation

Serum is the correct term for the fluid part of blood that remains after coagulation.
The process of clotting consumes fibrinogen (converting it to fibrin) and traps blood cells (corpuscles).
Therefore, the resulting fluid, serum, is defined as blood without corpuscles and fibrinogen.
It is essentially plasma from which the clotting factors have been removed.

Option A: Lymph is a fluid of the lymphatic system, not a direct component of blood circulation in the same way. Its composition is different, although it originates from blood plasma.
Option C: Plasma is the liquid component of blood that does contain fibrinogen. The question specifies a fluid without fibrinogen.
Option D: Platelets (thrombocytes) are one of the corpuscles (formed elements) in the blood, not a fluid. They are solid fragments involved in clotting.

Clinical Relevance

Nursing practice connection: Knowing Composition of Blood and its Components helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding the difference between serum and plasma is critical for nurses as it determines which type of blood collection tube to use for specific laboratory tests.
Serum is required for many chemistry, immunology, and serology tests (e.g., checking for antibodies, hormone levels, or drug levels).
Plasma is required for coagulation studies (like PT/INR) because the clotting factors must remain present and active for the test to be accurate.

How to Approach the Question

First, identify the key terms in the question: 'blood', 'without corpuscles', and 'without fibrinogen'.
Recall the basic composition of whole blood: it's made of plasma (liquid) and corpuscles (cells).
Consider the first condition: 'without corpuscles'. This eliminates whole blood and leaves the liquid portion, which is plasma.
Now, consider the second condition: 'without fibrinogen'. Plasma contains fibrinogen. The fluid that results after fibrinogen is used up in clotting is called serum.
Evaluate the options based on this deduction. Serum is plasma minus fibrinogen.
Eliminate the other options: Lymph is a different body fluid, and platelets are a type of corpuscle.

Concept Tested & Keywords

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E6 Nursing Brunner Adult Health 3SA Vol 1 Part 3 p. 114-116

E6 Anatomy Grays 43e Vol 1 Part 1 p. 103-105

E6 Anatomy Applied Ashalatha 4e p. 149-151

Practise the full UP CHO - 2018

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