Which of the following tests has a fasting requirement?

Choice A Reason:

Wiping the site with clean gauze after applying antiseptic is not recommended. This action can remove the antiseptic before it has had sufficient time to disinfect the area, potentially reintroducing bacteria to the site and increasing the risk of contamination.

Choice B Reason:

Allowing the site to air dry after applying antiseptic is the appropriate technique. This ensures that the antiseptic has enough contact time to effectively reduce microbial flora on the skin. Air drying also prevents any potential irritation that might be caused by wiping or touching the site before the venipuncture.

Choice C Reason:

Blowing on the site to speed up drying is not an appropriate technique. This can introduce bacteria from the breath to the clean site, which could lead to contamination and increase the risk of infection.

Choice D Reason:

Waving hands over the site is not an appropriate technique either. This action could potentially contaminate the site with bacteria or particles from the skin or the environment. It is also less effective in ensuring that the antiseptic has dried completely.

Choice A Reason:
Serology is the division of the laboratory that deals with the study of blood serum. In serology, the focus is on identifying and measuring antibodies in the serum. While serology can be used to support the diagnosis of infections, it does not involve culture and sensitivity testing, which is specific to identifying pathogens and determining their susceptibility to antibiotics.

Choice B Reason:
Microbiology is the correct division for culture and sensitivity tests. This division specializes in studying microorganisms, including bacteria, fungi, parasites, and viruses. When a culture and sensitivity test is ordered, it is the microbiology lab that cultures the sample to grow the organism and then tests various antibiotics to determine which are most effective against it.

Choice C Reason:
Histology is the study of the microscopic structure of tissues. Histology labs prepare and examine tissue samples to diagnose diseases, but they do not perform culture and sensitivity tests, which are specific to microbiology.

Choice D Reason:
Chemistry is a division of the laboratory that performs a wide range of tests to measure chemicals and enzymes in the body. These tests can include blood glucose levels, liver enzymes, and hormone levels, among others. However, chemistry does not handle culture and sensitivity testing, as this is not within the scope of chemical analysis.