SYSTEMIC LUPUS ERYTHEMATOSUS DIAGNOSIS |
|
|
Diagnosis of Systemic Lupus Erythematosus can be somewhat
difficult. There are no definitive tests for diagnosing Systemic Lupus Erythematosus. Many of
the symptoms and laboratory test results of Systemic Lupus Erythematosus patients are similar
to those of patients with different diseases, including rheumatoid
arthritis, multiple sclerosis, and various nervous system and blood
disorders.
Laboratory tests that are helpful in diagnosing Systemic Lupus Erythematosus include several
tests for a variety of antibodies commonly elevated in Systemic Lupus Erythematosus patients
(including antinuclear antibodies, anti-DNA antibodies, etc.). Systemic Lupus Erythematosus
patients tend to have low numbers of red blood cells (anemia) and
low numbers of certain types of white blood cells. The erythrocyte
sedimentation rate (ESR), a measure of inflammation in the body,
tends to be quite elevated. Samples of tissue (biopsies) from
affected skin and kidneys show characteristics of the disease.
A test called the lupus erythematosus cell preparation (or LE prep)
test is also performed. This test involves obtaining a sample of the
patient's blood. Cells from the blood are damaged in the laboratory
in order to harvest their nuclei. These damaged cells are then put
together with the patient's blood serum, the liquid part of blood
separated from the blood cells. Antinuclear antibodies within the
patient's serum will clump together with the damaged nuclear
material. A material called Wright's stain will cause these clumps
to turn blue. These stained clumps are then reacted with some of the
patient's white blood cells, which will essentially eat the clumps.
LE cells are the white blood cells that contain the blue clumps.
This test will be positive in about 70-80% of all patients with Systemic Lupus Erythematosus.
The American Rheumatism Association developed a list of symptoms
used to diagnose Systemic Lupus Erythematosus. Research supports the idea that people who
have at least four of the eleven criteria (not necessarily
simultaneously) are extremely likely to have Systemic Lupus Erythematosus. The criteria are:
Butterfly rash
Discoid rash
Photosensitivity
Mouth ulcers
Arthritis
Inflammation of the lining of the lungs or the lining around the
heart
Kidney damage, as noted by the presence of protein or other abnormal
substances called casts in the urine
Seizures or psychosis
The presence of certain types of anemia and low counts of particular
white blood cells
The presence of certain immune cells, anti-DNA antibodies, or a
falsely positive test for syphilis
The presence of antinuclear antibodies. |
|
|
| SYSTEMIC LUPUS ERYTHEMATOSUS RELATED ITEMS |
|
|
|
|