What are the five principles of specimen collection?

1, attention should be paid to aseptic operation when collecting samples to avoid bacterial contamination.

2, according to the different stages of patients, samples were collected from different parts.

3. Samples should be collected before using antibiotics, or drug antagonists should be added during separation and culture; Disinfectant should not be used when collecting, and normal saline can be used for washing when necessary, and materials can be obtained after drying.

4, as far as possible to collect the obvious parts of the lesion materials.

5. Specimens must be fresh and submitted for inspection as soon as possible after collection.

Extended data

Main categories—

1, whole sample:

It is usually used to identify plants, scientific names and Chinese herbal medicines. This specimen is also used for vegetation investigation in a certain area. For example, investigate the plant resources of a school or a hill.

2, anatomical specimens:

The purpose of production is to observe and study the internal tissue structure of plant organs. For example, dissect the bulb of onion and observe the structure of basal plate, bud, bulb and fibrous root.

3. Compare specimens:

Comparative specimens mainly compare the similarities and differences of an organ of different plants. For example, in order to compare the seed morphology of dicotyledonous plants and monocotyledonous plants, it is necessary to collect mature fruits, such as rape, soybean, cucumber and tomato, remove the peel, dry the seeds, and collect the fruits of wheat, rice and corn for comparison.

Baidu Encyclopedia-Specimen Collection and Transportation