Examples of “serum” in a Sentence

noun A thin, lightweight skincare product, usually applied after cleansing and before a heavier cream, formulated to carry a high proportion of active ingredients in a small amount of liquid.

• She kept the serum on the shelf above the sink and used it before her moisturiser.
• Two drops of serum were enough for his whole face.
• Pat the serum gently into your skin before putting on moisturiser.

noun In medicine, the clear pale fluid that separates from blood when it clots, containing no cells and no clotting proteins. It is the part of a blood sample many laboratory tests are run on.

• The lab measured cholesterol in the patient's serum.
• Serum was separated from the sample before testing.
• The technician spun the blood sample to collect the serum for testing.

noun A preparation made from the blood of a person or animal that carries antibodies, given to provide immediate protection against a poison or infection.

• Antivenom serum was flown to the hospital overnight.
• The doctor gave the patient serum to fight the infection quickly.
• Years ago, serum from immunized horses was used to treat snake bites.