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Letters |
INOVA Diagnostics Inc., San Diego, CA 92131-123
aAuthor for correspondence.
| The first 20% of the full text of this article appears below. |
To the Editor:
Anticardiolipin antibody (ACA) tests are among the most difficult of all ELISAs to standardize. There are the well-known difficulties of adhering the phospholipid to a plastic microwell plate. In addition, the antigen solid phase is complex, consisting of both the phospholipid plus a necessary cofactor, known as ß2-glycoprotein (ß2-GPI), and the blocking agent. Then there is the added problem of having to calibrate each reagent set to a reference preparation that consists of pooled human
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