Complete Blood Count (CBC) Test

What is this test? A complete blood count, or CBC, is a routine blood test that measures the cells circulating in your blood, including red blood cells, white blood cells, hemoglobin, hematocrit, and platelets. Providers use it during checkups, to investigate symptoms such as fatigue, weakness, or fever, and to monitor many health conditions and treatments over time.

The Homogeneous Nuclear Antibody test is a blood test that detects the presence and measures the titer (concentration) of antinuclear antibodies (ANA) showing a homogeneous (diffuse) staining pattern when examined under a microscope. This pattern appears as the entire nucleus staining evenly, which is typically associated with antibodies against double-stranded DNA (dsDNA) and histones.

How is the test performed? A health care professional will draw a small sample of blood, usually from a vein in your arm, using a thin needle. The process takes only a few minutes, and the sample is sent to a laboratory where an automated analyzer counts and measures your blood cells. You can usually return to your normal activities right away.

A healthcare professional will draw a small blood sample from a vein in your arm. The sample is then sent to a laboratory where it is analyzed using immunofluorescence techniques to detect the presence of antinuclear antibodies and determine both the pattern (homogeneous) and the titer (how much the sample can be diluted and still show a positive result).

What do the results mean? Your report will show a number for each blood cell type along with a normal reference range. Values that are higher or lower than expected may point to conditions such as anemia, infection, inflammation, clotting problems, or blood disorders. Many results fall slightly outside the range without indicating serious illness, so your provider will interpret them together with your symptoms, medical history, and other tests.

A positive homogeneous ANA pattern with a high titer (typically 1:160 or higher) suggests the presence of an autoimmune disease, most commonly systemic lupus erythematosus (SLE). However, a positive result does not automatically mean you have a disease—some healthy individuals, especially older adults, may have low-level positive ANA results. Your doctor will interpret the results in context with your symptoms, physical examination, and other test results.

Are there any risks? This test is very safe. You may feel a brief sting when the needle goes in, and the puncture site can be slightly sore or bruised for a day or two. Serious complications, such as excessive bleeding, infection, or fainting, are rare. Tell your provider if you take blood thinners or have had trouble with blood draws in the past.

This is a standard blood test with minimal risks. You may experience slight pain, bruising, or dizziness during or after the blood draw. These symptoms are usually temporary and resolve quickly.