What should you know about CHROMagar and mastitis?

Mastitis means inflammation of breast tissue. During breastfeeding, it can follow ineffective milk removal and may occur with or without a bacterial infection. A clinician may send expressed milk for culture when symptoms are severe, keep returning, or do not improve as expected. In the laboratory, a medium such as CHROMagar can support microbial growth and produce characteristic colony appearances. The laboratory interprets those findings alongside other identification or susceptibility methods; the plate appearance alone does not determine treatment.

Seek a clinical assessment for a hot, swollen, red or painful area of the breast, especially if you feel feverish or unwell. If breastfeeding, continue feeding or expressing as comfortably as possible unless your clinician advises otherwise. Avoid forceful massage because it can aggravate inflamed tissue. A lactation professional can check attachment, feeding position, milk transfer and pumping technique. If a culture was performed, ask which organism was identified, whether susceptibility testing was completed and whether the result changes the care plan.

Arrange prompt medical care if breast redness or pain is worsening, fever persists, symptoms return after treatment, or there is a new lump or fluid-filled swelling. Seek urgent assessment if you feel faint, confused, short of breath or severely unwell. A persistent focal swelling may need examination and imaging to check for an abscess, which can require drainage rather than antibiotics alone.

Ask whether your symptoms fit inflammatory mastitis, bacterial mastitis or an abscess; why a milk culture is being considered; how the sample should be collected; and when the result will alter treatment. Also ask which pain relief is suitable for you and how to maintain comfortable milk removal while the breast settles.