Renal stone: A stone in the kidney (or lower down in the urinary tract). Also called a kidney stone. Renal stones are a common cause of blood in the urine and pain in the abdomen, flank, or groin. Kidney stones occur in 1 in 20 people at some time in their life. The development of the stones is related to decreased urine volume or increased excretion of stone-forming components such as calcium, oxalate, urate, cystine, xanthine, and phosphate.
In general, antibody tests that use blood can detect HIV slightly sooner after infection than tests done with oral fluid. It can take 3 to 12 weeks (21-84 days) for an HIV-positive personâs body to make enough antibodies for an antibody test to detect HIV infection. This is called the window period.
The time at which antibodies to HIV appear is called seroconversion. Before this time, an HIV antibody test will give a negative result. During suspected primary HIV infection, other forms of test can be used to detect the presence of the virus (or antigen).Such tests respond to a specific protein on the HIV virus, although as HIV becomes fully established in the body the protein will fade to undetectable levels and the test will be inaccurate.he time at which antibodies to HIV appear is called seroconversion. Before this time, an HIV antibody test will give a negative result. During suspected primary HIV infection, other forms of test can be used to detect the presence of the virus (or antigen).