Measure | Abbreviation | Calculation |
---|---|---|
Iodine: creatinine ratio (μg/g) | I/Cr | UIC (μg/L) / UCr (g/L) |
Measured 24-h urine iodine excretion (μg/d) | Measured 24hUIE | 24hUIC (μg/L) × 24 h urine (L) |
Estimated 24-h urine iodine excretion1 (μg/d) | Estimated 24 h UIE1 | I/Cr (μg/g) × Pr24hCr (g/d) |
Pr24hCr (g/d) = 24hUCr (g/L) × 24 h urine (L) | ||
Estimated 24-h urine iodine excretion2 (μg/d) (Tanaka T, et al.[31]) | Estimated 24 h UIE2 | I/Cr (μg/g) × Pr24hCr (g/d) |
Pr24hCr (mg/d) = [(− 2.04 × age (year)] + [(14.89 × weight | ||
(kg)] + [16.14 × height (cm)]—2244.45 | ||
Estimated 24-h urine iodine excretion3 (μg/d) (Kawasaki T, et al.[32]) | Estimated 24 h UIE3 | I/Cr (μg/g) × Pr24hCr (g/d) |
Males: | ||
Pr24hCr (mg/d) = [− 12.63 × age (year)] + [15.12 × weight | ||
(kg)] + [7.39 × height (cm)]—79.9 | ||
Females: | ||
Pr24hCr (mg/d) = [− 4.72 × age (year)] + [8.58 × weight (kg)] | ||
+ [5.09 × height (cm)]—74.5 | ||
Estimated 24-h urine iodine excretion4 (μg/d) (Mage, et al.[33]) | Estimated 24 h UIE4 | I/Cr (μg/g) × Pr24hCr (g/d) |
Males: | ||
Pr24hCr (mg/d) = 0.00179 × [140—age (year)] × [weight | ||
(kg)1.5 × height (cm)0.5] × [1 + 0.18 × A × [1.366–0.0159 × | ||
BMI (kg/m2)]. | ||
Females: | ||
Pr24hCr (mg/d) = 0.00163 × [140—age (year)] × [weight | ||
(kg)1.5 × height (cm)0.5] × [1 + 0.18 × A × [1.429–0.0198 × | ||
BMI (kg/m2)]; where A is African American or black race = 1, | ||
other race = 0 | ||
Estimated 24-h urine iodine excretion5 (μg/d) (Knudsen N, et al.[27]) | Estimated 24 h UIE5 | I/Cr (μg/g) × Pr24hCr (g/d) |
Males: | ||
pr24hCr (g/d) = 1.74 g (25–49 years), 1.63 g (50–59 years) | ||
Females: | ||
pr24hCr (g/d) = 1.23 g (25–49 years), 1.15 g (50–59 years) | ||
Estimated 24-h urine iodine excretion6 (µg/d) (IOM[34]) | Estimated 24 h UIE6 | iodine excretion (µg/d) = 0.9 × iodine intake (µg/d) |
iodine intake (µg/d) = spot UIC (µg/L)/ 0.92 × (0.0009 L · h−1 | ||
· kg−1 · 24 h · d−1) × weight (kg) |