Fosinopril and Total IgG Immunoassay (Serum/Plasma)

What Does IgG Measure?

IgG, or Immunoglobulin G, is the most abundant antibody in your blood. It plays a key role in long-term immunity by helping your body recognize and fight off pathogens like bacteria and viruses. IgG antibodies are produced by your immune system in response to infections or vaccines, and they remain in your system for extended periods to provide lasting protection.

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you’re taking fosinopril (a medication for blood pressure) and want to monitor how your immune system is responding to it. IgG levels can also be checked if you have concerns about immune function, recurrent infections, or other immune-related conditions.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then processed to measure IgG levels using an immunoassay method, which detects specific antibodies in your blood. This test is typically done on serum or plasma, depending on the lab’s protocol.

What Does the Result Mean?

Results may be compared to general reference ranges for IgG, though individual ranges can vary. Abnormally low IgG could indicate immune deficiencies, while very high levels might suggest chronic infections, autoimmune conditions, or other health issues. Your fosinopril medication may also influence antibody production, so results should be interpreted in the context of your overall health and treatment plan.