TABLE 1.
Results of serological tests at admissiona
| Patient | RF (IU/ml) | Titer obtained with indicated test
|
CIEP result (no. of bands/titer) | Lateral flowb
|
||||
|---|---|---|---|---|---|---|---|---|
| RB | SAT
|
Coombs IgG | ||||||
| pH 7.2 | pH 5.0 | IgM | IgG | |||||
| 1 | 175 | 32 | 1,280 | 40,960 | 40,960 | 6/128 | 4+* | 4+ |
| 2 | Neg | Neg | 40 | 160 | 1,280 | Neg | Neg | 1± |
| 3 | ND | Neg | Neg | ND | ND | ND | ND | ND |
a
Abbreviations: Neg, negative; ND, not done.
b
1+, weak staining; 2+, moderate staining; 3+, strong staining; 4+, very strong staining; *, IgM was initially 4+ but became negative after absorption of RF.