Three criteria for a properly made malarial smear include:

A properly made malarial smear is essential for the accurate diagnosis of malaria, and it involves specific criteria to ensure that the smear will provide the best results during examination under a microscope.

The ideal characteristics of a malarial smear include being of sufficient size, smoothness, and clarity for effective microscopic evaluation. A smear that is read through, of a quarter size, and exhibits a smooth and even surface is ideal because it allows for a consistent distribution of the blood film. This uniformity is crucial for identifying malaria parasites throughout the smear; irregularities in thickness or not achieving a proper spreading can lead to misinterpretation or missed diagnoses.

Additionally, these characteristics help in providing a clear view of the different cellular components present in the blood and ensure that any malaria parasites can be easily observed and quantified.

Other options listed may mention certain factors relevant to blood smears, but they do not capture the essential criteria specifically required for malarial smears, making them less suitable as correct answers.