Plasma Without Clotting Factors is Known as

Plasma without fibrinogen & other clotting factors is known as:

Correct Answer: Serum

Serum = Plasma − (Fibrinogen + Other clotting factors). When blood clots, fibrinogen and other coagulation proteins are consumed in clot formation, and the remaining liquid is serum.

Plasma vs Serum

• Plasma: The liquid component of unclotted blood (contains fibrinogen, clotting factors, albumin, globulins, electrolytes, hormones, etc.). Obtained by centrifuging blood collected with anticoagulant (EDTA, heparin, sodium citrate).
• Serum: The liquid that remains after blood has clotted and the clot is removed. Lacks fibrinogen and other clotting factors. Obtained by centrifuging clotted blood.

Uses in Diagnostics

• Serum: Used for most biochemistry tests (liver enzymes, kidney function, electrolytes), antibody titres, serology.
• Plasma: Used for coagulation tests (PT, APTT) and where clotting factors need to be preserved.

Formula to Remember

Blood = Plasma + Formed elements
Plasma = Serum + Fibrinogen + Clotting factors
Serum = Plasma − Fibrinogen − Clotting factors