TABLE 1.
Mean and coefficients of variation (CVs) of carcinoembryonic antigen (CEA) measurements (ng/mL) from five routine systems.
| CEA (IU/mL) | System | PB | XQ | RP | D | M | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| n | Mean (ng/mL) | CV (%) | Mean (ng/mL) | CV (%) | Mean (ng/mL) | CV (%) | Mean (ng/mL) | CV (%) | Mean (ng/mL) | CV (%) | |
| 0.0625 | 5 | 4.02 | 13.14 | 4.83 | 13.91 | 4.20 | 15.42 | 4.34 | 14.60 | 4.16 | 14.12 |
| 0.0625 | 5 | 4.02 | 13.14 | 4.83 | 13.91 | 4.20 | 15.42 | 4.34 | 14.60 | 4.16 | 14.12 |
| 0.125 | 5 | 7.64 | 14.65 | 8.62 | 15.09 | 8.25 | 17.56 | 8.23 | 12.89 | 8.06 | 15.51 |
| 0.25 | 5 | 15.34 | 14.99 | 17.17 | 14.68 | 16.66 | 17.03 | 17.16 | 17.26 | 16.25 | 15.16 |
| 0.5 | 5 | 32.90 | 14.95 | 34.17 | 14.59 | 32.92 | 14.45 | 35.06 | 16.53 | 34.40 | 16.48 |
| 1 | 5 | 63.20 | 13.02 | 66.91 | 16.07 | 64.39 | 14.61 | 67.47 | 13.02 | 64.78 | 15.24 |
| 2 | 5 | 120.91 | 15.02 | 126.81 | 16.08 | 125.86 | 16.82 | 130.49 | 16.61 | 127.46 | 18.05 |
| 4 | 5 | 243.32 | 17.19 | 250.73 | 19.23 | 250.49 | 18.50 | 253.19 | 16.67 | 244.30 | 22.06 |
| 8 | 5 | 488.48 | 18.00 | 503.09 | 18.90 | 484.45 | 17.31 | 522.41 | 18.20 | 503.71 | 21.23 |
Abbreviations: D, Dulbecco's modified Eagle medium; M, minimal essential medium; PB, phosphate‐buffered saline buffer; RP, RPMI 1640 medium; XQ, healthy human serum.