| Public and private health centres | Reference values (ng/ml) | Women | Men |
| Clinical Laboratory, Cornellá-Barcelona, Catalonia | 30–300 | ||
| Basurto Hospital, Vasco Country | 15–150 | ||
| Laboratory Echevarne, Granada, Andalusia | 10–204 | ||
| San Juan de Dios Hospital, Barcelona, Catalonia | 10–120 | ||
| La Plana Hospital, Vila-Real Valencian Community | 5–150 | 5–150 | 20–200 |
| Unilabs, Barcelona, Catalonia | 5–140 | 29–280 | |
| Hermanos Miralles Primary Care Centre, Madrid | 14–150 | 40–340 | |
| Folguera Laboratory, Barcelona, Catalonia | 15–150 | 30–400 | |
| Fornells, Oló, Crespo Laboratory, Barcelona, Catalonia | 20–200 | 20–450 |