Final answer:
A Cytobroom is the instrument used to collect both ectocervical and endocervical cells for a Pap smear test, allowing for the detection of conditions such as cervical cancer.
Step-by-step explanation:
The instrument used to collect both ectocervical and endocervical cells is called a Cytobroom. The cytobroom is specifically designed to collect cells from these areas of the cervix for cytological evaluation, such as in a Pap smear test. This test helps cytotechnologists to stain the cells and examine them for any signs of abnormal growth or microbial infection, which could indicate conditions like cervical cancer. Other collection methods for different types of testing may include wet mounts with NaCl or KOH, but for a Pap smear that includes both ectocervical and endocervical cell collection, a cytobroom is typically used.