| uU/mL | mU/L | |
| Premature infants | ||
| (28-36 wk gestation): | 0.7-27 | 0.7-27 |
| 1-4 days: | 1.0-39 | 1.0-39 |
| 2-20 wk: | 1.7-9.1 | 1.7-9.1 |
| 5 mo-20 yr: | 0.7-6.4 | 0.7-6.4 |
| Adults | ||
| 21-54 yr: | 0.4-4.2 | 0.4-4.2 |
| 55-87 yr: | 0.5-8.9 | 0.5-8.9 |
| Pregnancy | ||
| First trimester: | 0.3-4.5 | 0.3-4.5 |
| Second trimester: | 0.5-4.6 | 0.5-4.6 |
| Third trimester: | 0.8-5.2 | 0.8-5.2 |