Table 2 Age and sex specific serum neonatal reference intervals for TSH and FT4
M + F | M | F | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Item | Units | Age (days) | n | LL | UL | n | LL | UL | n | LL | UL |
TSH | µIU/mL | 2 to 4 | 244 | 0.403 | 7.942 | 138 | 0.334 | 9.654 | 106 | 0.356 | 7.154 |
5 to 7 | 660 | 0.418 | 6.319 | 341 | 0.428 | 6.088 | 319 | 0.417 | 6.971 | ||
2 to 7 | 904 | 0.418 | 6.973 | 479 | 0.416 | 7.041 | 425 | 0.418 | 6.973 | ||
8 to 30 | 314 | 0.473 | 7.015 | 154 | 0.609 | 7.557 | 160 | 0.420 | 6.189 | ||
FT4 | ng/dL | 2 to 4 | 244 | 1.19 | 2.59 | 138 | 1.18 | 2.62 | 106 | 1.20 | 2.49 |
5 to 7 | 660 | 1.21 | 2.29 | 341 | 1.13 | 2.30 | 319 | 1.23 | 2.29 | ||
2 to 7 | 904 | 1.20 | 2.42 | 479 | 1.16 | 2.43 | 425 | 1.23 | 2.32 | ||
8 to 30 | 314 | 1.02 | 2.01 | 154 | 0.94 | 1.99 | 160 | 1.02 | 2.02 | ||