Median values (and ranges) of IgG subclasses in sputum and serum from 44 patients with bronchiectasis
| Nature of sputum | |||
|---|---|---|---|
| Mucoid | Mucopurulent | Purulent | |
| IgG1 | |||
| Serum (g/l) | 6.77 (2.6–13.6) | 10.61 (4.4–13.4) | 7.17 (3.9–13.9) |
| Sputum (g/l) | 0.10 (0.01–0.26) | 0.26 (0.1–0.37) | 0.40 (0.24–1.3) |
| Sputum (% serum) | 1.47 (0.1–7.8) | 2.53 (0.9–7.5) | 5.99 (2.5–12.7) |
| Ratio corrected for albumin | 1.42 (0.2–7.6) | 1.84 (0.1–15.3) | 3.20 (0.8–6.8) |
| IgG2 | |||
| Serum (g/l) | 4.33 (1.5–7.0) | 3.03 (1.5–6.9) | 4.07 (1.8–7.8) |
| Sputum (g/l) | 0.06 (0.01–0.32) | 0.16 (0.06–0.49) | 0.23 (0.05–0.5) |
| Sputum (% serum) | 1.73 (0.2–4.9) | 6.4 (1.3–27.6) | 5.74 (1.8–13.8) |
| Ratio corrected for albumin | 1.38 (0.3–6.8) | 7.03 (0.4–26.7) | 2.13 (0.9–14.0) |
| IgG3 | |||
| Serum (g/l) | 0.66 (0.2–2.8) | 0.79 (0.4–1.5) | 1.15 (0.4–4.4) |
| Sputum (g/l) | 0.03 (0.002–0.1) | 0.13 (0.06–0.22) | 0.22 (0.07–0.3) |
| Sputum (% serum) | 4.17 (0.3–40.6) | 12.5 (5.9–45.7) | 16.92 (3.2–54.7) |
| Ratio corrected for albumin | 3.65 (1.2–32.0) | 11.19 (1.9–69.1) | 8.33 (0.8–46.3) |
| IgG4 | |||
| Serum (g/l) | 0.29 (0.1–1.0) | 0.19 (0.1–3.4) | 0.20 (0.1–1.4) |
| Sputum (g/l) | 0.04 (0–0.22) | 0.11 (0.03–0.3) | 0.21 (0–0.28) |
| Sputum (% serum) | 6.44 (0.4–162.9) | 52.63 (2.9–175) | 32.18 (18.3–172) |
| Ratio corrected for albumin | 5.90 (0.4–128.3) | 24.79 (0.7–193) | 12.12 (3.7–113) |
Median values of sputum expressed as a percentage of serum are also shown together with this ratio corrected for the ratio of sputum to serum albumin. Values are divided into the three categories according to the usual nature of secretions produced by the patient when clinically stable.