I’d like to start by thanking everyone for their support in getting this site moving in the right direction. I’ve learned so much from from your comments and from the research I’ve done for the articles here. I was feeling pretty discouraged about the site and the lack of readers and comments, but I think we are now going to be able to make this site a valuable resource for lupies and their friends and families.

I’ve finished the second chapter of Living With Lupus: All the Knowledge You Need to Help Yourself by Sheldon Paul Blau, M.D. with Dodi Schultz. Remember, I’m reading the first edition, so if you have the second edition, it may be slightly different. I also found that a good deal of the book is available in a preview at Google Books.

Diagnosis: What Makes the Difference is the title of chapter 2. A lupus diagnosis is not simple and is usually made by a specialist. A primary-care physician will not usually possess the necessary depth of experience with lupus, and often will refer the patient to a specialist. Even a specialist faces a difficult diagnosis. Blau states that the doctor’s conclusions will be based on a combination of three factors:

1. The patient’s complaints. This is difficult because there is a huge overlap with other symptoms related to other connective-tissue disorders, which include rheumatoid arthritis, scleroderma, dermatomyositis, and polymyositis.
2. Established diagnostic criteria. These criteria were developed by the American College of Rheumatology and are known as the ACR criteria. I’ll list these later.
3. Other factors. Diagnostic tests that rely on two concepts, sensitivity and specificity. I learned a lot from these links, but the short explanation of all of it is that there is no diagnostic test that will give a 100% accurate diagnosis of lupus; therefore, a diagnosis must come from a combination of analytic factors.

There are eleven diagnostic criteria for lupus as determined by the American College of Rheumatology. A patient must exhibit four of the eleven criteria, but not necessarily all at the same time. The Lupus Foundation website has a brief explanation of the eleven criteria. I would like to look at them in depth, but I think that may be better accomplished with a separate post.

According to Dr. Blau, there are other indications that may lead a doctor to suspect lupus:

…there are a number of other signs, symptoms, and test results that, if present with others, will lead an experienced specialist to consider the possibility that a patient may have lupus. Some are considered more significant than others. Among them (the first two were included in the earlier, 1970s criteria but were later dropped). [p. 30]

These other indicators are as follows:

• Hair loss. 25% of all lupus patients experience some degree of hair loss.
• Raynaud’s phenomenon. Dr. Blau mentions that there are varied estimates of the percentage of lupus patients who also suffer from Raynaud’s phenomenon, but I found an article from the Cleveland Clinic that puts the value at approximately 33%.
• Free DNA. Apparently, high levels of freely circulating DNA is often a result of the cell destruction caused by the antibodies in lupus. I really don’t understand this very well, but I did find an article if you happen to be interested.
• High sedmentation rate. This the sinking velocity of red cells within a quantity of drawn blood, and is often referred to as the “sed rate“, one of those things I’ve heard mentioned for years, but had no idea what it meant until now.
• Other antibodies. This refers to the existence of autoantibodies that attack the patient’s own cells, tissues, and organs. Specific tests can determine what types of autoantibodies are present and what substances they target.
• Serum complement. This refers to a finite amount of proteins, referred to as the complement system, that act as part of the immune system. Since the proteins are drawn to areas where antibodies are active, a low serum level in the general circulation can be indicative of lupus.
• Rheumatoid factor. The rheumatoid factor is a blood test used in the diagnosis of rheumatoid arthritis.
• False-positive AIDS test. According to VirusMyth.net, SLE is one of the identified factors that can cause a false-positive result on the ELISA test for the HIV antibody.

The chapter ends with a discussion of how lupus can be confused with certain disorders, like the childhood illness commonly known as “fifth disease” and technically known as erythema infectiosum. Lupus is known as the “great imitator” because of the difficulties involved in reaching a diagnosis. Previously, syphilis held this title, which is ironic, since a false-positive test for syphilis is one of the eleven criteria for a lupus diagnosis.

I know that my wife’s diagnosis at age 15 is remarkable considering how many people suffer for years, possibly decades, with lupus before receiving a positive diagnosis. This leads me to some possible areas of discussion for this chapter:

• How long did it take for you or your loved one’s lupus diagnosis?
• How many of the eleven ACR diagnostic criteria for lupus do you or your loved one exhibit?
• What were or are some of the “roadblocks” you or your loved one have encountered while trying to get a diagnosis?