A CD4 cell is a type of red blood cell that fights viral or bacterial infections in the body by sending signals to activate the immune system, explains CD4 cells are often referred to as T-cells or T-helper cel... More » Health Conditions & Diseases

AIDS is the final stage of HIV infection, during which the blood CD4 cell count falls to or below 200 cells per cubic millimeter, or the patient develops one or more opportunistic infections because of an impaired immune... More » Health Conditions & Diseases

CD4 cells protect the body from infection by circulating in the blood to identify bacteria and viruses then produce antibodies to destroy them. CD4 cells also trigger the body to respond to infection by sending signals t... More » Science Human Anatomy Blood
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Viral load refers to the amount of HIV in a sample of a patient’s blood, while a CD4 count is a lab test that determines the amount of CD4 cells in a sample of the patient’s blood, according to A high viral loa... More » Health Conditions & Diseases

A normal CD4 count ranges from 500 to 1,500 cells per cubic millimeter of blood, states WebMD. Any value below this range indicates a weak immune system. More » Health Medical Ranges & Levels

Neurogenic shock is a type of shock where there is insufficient blood flow throughout the body due to loss of signals from the sympathetic nervous system to the smooth muscle in vessel walls, according to MedicineNet. Th... More » Health Conditions & Diseases

Someone who is diagnosed as HIV positive has had two separate tests for HIV antibodies in the body come back with positive results, according to Someone who is HIV positive does not have AIDS but may develop it... More » Health Conditions & Diseases