Product number: 7268

Blood Agar Base, Improved is used with blood for the isolation and cultivation of a wide variety of fastidious microorganisms in a laboratory setting. Blood Agar Base, Improved is not intended for use in the diagnosis of disease or other conditions in humans.

Blood agar bases are typically supplemented with 5 – 10% sheep, rabbit, or horse blood for use in isolating, cultivating, and determining hemolytic reactions of fastidious pathogenic microorganisms. Without enrichment, blood agar bases can be used as general purpose media.

In 1919, Brown experimented with blood agar formulations for the effects of colony formation and hemolysis. In Blood Agar Base, Improved, the formula was modified slightly to enhance organism growth and neutralize any toxic metabolites. Blood Agar Base media are specified in standard method procedures for food testing.


Formula Liter
Enzymatic Digest of Casein 15 g
Enzymatic Digest of Animal Tissue 4 g
Yeast Extract 2 g
Corn Starch 1 g
Sodium Chloride 5 g
Agar 14 g

Final pH: 7.0 ± 0.2 at 25°C
Formula may be adjusted and/or supplemented as required to meet performance specifications.


  1. Suspend 42 g of the medium in one liter of purified water.
  2. Heat with frequent agitation and boil for one minute to completely dissolve the medium.
  3. Autoclave at 121°C for 15 minutes.
  4. Prepare 5 – 10% blood agar by aseptically adding the appropriate volume of sterile defibrinated blood to melted sterile agar medium, cooled to 45 – 50°C.

Order Details

Product # Product Description
7268A Blood Agar Base, Improved, 500 g
7268T Blood Agar Base, Improved, 5 kg
7268C Blood Agar Base, Improved, 10 kg

Reference Material

7268 - Blood Agar Base, Improved, Product Information Sheet [English] [Portuguese]
7268 - Blood Agar Base, Improved, Safety Data Sheet [Danish] [Dutch] [English] [EU English] [Finnish] [French] [German] [Italian] [Spanish, Mexico] [Swedish]

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