Which fixation methods are preferred for May-Grunwald Giemsa staining?

• A. Zenker's or B-5; 10% NBF can be used
• B. Bouin's solution only
• C. Formal in fixed only
• D. Alcohol-fixed only

Answer: (A)

May-Grunwald Giemsa staining relies on fixing cells in a way that preserves morphology and allows the dyes to interact with cellular components to give crisp nuclear and cytoplasmic detail. Mercurial-based fixatives such as Zenker's and B-5 are especially good for this because they fix rapidly and maintain delicate cytoplasmic features and nuclear integrity, producing the clear, differential staining that MGG is known for. Ten percent neutral buffered formalin can also be used as a fixative, offering reliable preservation without excessive distortion, though it may require small protocol tweaks. Bouin's solution often introduces background coloration from picric acid and can interfere with staining, making it less suitable for MGG. Fixation that's limited to alcohol alone tends to give less consistent results for the MGG protocol. So the preferred options include Zenker's or B-5, with 10% NBF as an acceptable alternative.