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Distribution of progestogens bound to SHBG or CBG in blood
| Progestogen (Ref.) | SHBG-bound (%) | CBG-bound (%) | Albumin-bound (%) | Free (%) |
|---|---|---|---|---|
| Norethindrone (13) | 35.5 | ND | 60.8 | 3.7 |
| Levonorgestrel (13) | 47.5 | ND | 50.0 | 2.5 |
| Etonogestrel (14) | 31.6 | ND | 65.9 | 2.5 |
| Gestodene (14) | 75.3 | ND | 24.1 | 0.6 |
| Progesterone (15) | 0.6 | 17.7 | 79.3 | 2.4 |
CBG, Corticosteroid-binding globulin; ND, not detected.
