Table 4.
Examples of false-positive hCG resultsa for different assays in seven patients erroneously diagnosed with choriocarcinoma or gestational trophoblastic disease6,104
| Patient No.b | RIA (IU/L) | Abbott AxSYM (IU/L) | Bayer ACS:180 or Centaur (IU/L) | Beckman Access (IU/L) | DPC Immulite (IU/L) | Dade Behring Stratus (IU/L) | Serono MAIAclone (IU/L) |
|---|---|---|---|---|---|---|---|
| 1 | 28 | 14 | 9.7 | 30 | - | <2 | <2 |
| 2 | <2 | 68 | <2 | 4.6 | <2 | <2 | 2.0 |
| 3 | 10 | 110 | 4.5 | 6.6 | 4.2 | 2.6 | 13 |
| 4 | 11 | 175 | <2 | <2 | <2 | - | 7.8 |
| 5 | - | 139 | 32 | - | <2 | - | - |
| 6 | - | - | 12 | - | 42 | - | - |
| 7 | - | - | - | - | - | 23 | - |
-, Not measured
a
hCG values ≥10 IU/L are highlighted
b
All false-positive hCG results were identified by finding hCG immunoreactivity in serum but not in a concurrent urine sample. The addition of heterophile blocking reagent prevented false results