Plasma fructosamine and its relation to plasma total protein and albumin was examined in 40 non-diabetic pregnant women. Plasma fructosamine did not correlate with haemoglobin A1 or plasma albumin. The mean intra-individual ranges were plasma fructosamine 0.53 mmol/l (SD 0.17); haemoglobin A1 1.42% (SD 0.42); plasma fructosamine/g albumin 0.024 mmol (SD 0.005) and plasma fructosamine/g total protein 0.008 mmol (SD 0.003). A high degree of individuality for these variables was also observed.