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To detect human immunodeficiency virus (HIV), most laboratory tests focus on the:

A.

CD4 counts

B.

Virus

C.

HIV antibodies

D.

CD8 counts

Answer and Explanation

The Correct Answer is C

Choice A reason: CD4 counts are not used to detect HIV, but to monitor the progression of the infection and the immune system status. CD4 cells are a type of white blood cell that HIV targets and destroys. A normal CD4 count ranges from 500 to 1,500 cells per microliter of blood. A low CD4 count indicates a high risk of opportunistic infections and AIDS.

Choice B reason: Virus is a vague term that does not specify what kind of virus is being detected. HIV is a type of virus that belongs to the retrovirus family. It is difficult to detect the virus itself, as it hides inside the host cells and has a low concentration in the blood. Therefore, most laboratory tests focus on the antibodies that the body produces in response to the virus.

Choice C reason: HIV antibodies are the most common way to detect HIV, as they are produced by the immune system to fight the virus. Antibodies are proteins that bind to specific antigens (foreign substances) and mark them for destruction. HIV antibodies can be detected by a blood test, a saliva test, or a rapid test. However, antibodies may take several weeks to develop after exposure, so a negative test does not rule out the possibility of infection.

Choice D reason: CD8 counts are not used to detect HIV, but to monitor the immune system response and the viral load. CD8 cells are a type of white blood cell that kill infected cells and secrete antiviral substances. A high CD8 count indicates a strong immune response and a low viral load. A low CD8 count indicates a weak immune response and a high viral load.


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Related Questions

Correct Answer is D

Explanation

Choice A reason: None of the above is incorrect because the other choices are not true statements about the overall number of cases of STIs.

Choice B reason: Staying about the same is incorrect because the overall number of cases of STIs is not constant. According to the World Health Organization, more than 1 million STIs are acquired every day worldwide.

Choice C reason: Going down is incorrect because the overall number of cases of STIs is not decreasing. On the contrary, some STIs such as syphilis, gonorrhea, and chlamydia are resurging in many regions due to factors such as antimicrobial resistance, lack of access to prevention and treatment services, and stigma.

Choice D reason: Rising is correct because the overall number of cases of STIs is increasing globally. The World Health Organization estimates that there were 376 million new cases of four curable STIs (chlamydia, gonorrhea, syphilis, and trichomoniasis) in 2016, up from 357 million in 2012. Additionally, there are millions of cases of incurable STIs such as herpes, HPV, and HIV that affect the health and well-being of people worldwide.

Correct Answer is D

Explanation

Choice A reason: This is a correct statement, as the NST measures the fetal heart rate and its response to fetal movement. The nurse will place two belts around the client's abdomen, one to monitor the heart rate and one to monitor the contractions.

Choice B reason: This is a correct statement, as the NST usually takes 20 to 30 minutes to complete. The nurse will look for at least two accelerations of the fetal heart rate within a 20-minute period.

Choice C reason: This is a correct statement, as the NST is more likely to be reactive (normal) when the baby is active. The client may be asked to eat or drink something before the test to stimulate the baby's movement.

Choice D reason: This is an incorrect statement, as the client does not have to lie on her back during the test. Lying on the back can compress the inferior vena cava and reduce the blood flow to the placenta. The client can lie on her side or sit in a reclining chair during the test.

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