Table 3.

Interference Test of Four Methods

Hemoglobin concentration (g/l)	Nephelometry (%)	Turbidimetry (%)	Immuno‐colloidal gold method (%)	RIA (%)
0.11	−6.9	−1.8	−10.1	−2.2
0.23	−7.7	−2.6	−10.1	−4.3
0.46	−7.7	1.7	−11.9	−10.0
0.61	−8.4	6.7	−17.4	−8.7
0.91	−8.8	14.1	−13.8	−10.4
1.82	−9.5	26.3	−17.8	−11.8
2.74	−11.4	27.8	−21.1	−12.5