Concentrations of free T4, T4, T3, and TSH in preterm and term infants in cord blood at birth and at 7, 14, and 28 days of age (mean±1 SD)

Gestation (weeks)	Age of infant	Free T4 (ng/dL)	T4 (mcg/dL)	T3 (ng/dL)	TSH (mU/L)
23 to 27 weeks	Cord	1.28±0.4	5.4±2.0	20±15	6.8±2.9
	7 days	1.47±0.6	4.0±1.8	33±20	3.5±2.6
	14 days	1.45±0.5	4.7±2.6	41±25	3.9±2.7
	28 days	1.50±0.4	6.1±2.3	63±27	3.8±4.7
28 to 30 weeks	Cord	1.45±0.4	6.3±2.0	29±21	7.0±3.7
	7 days	1.82±0.7	6.3±2.1	56±24	3.6±2.5
	14 days	1.65±0.4	6.6±2.3	72±28	4.9±11.2
	28 days	1.71±0.4	7.5±2.3	87±31	3.6±2.5
31 to 34 weeks	Cord	1.49±0.3	7.6±2.3	35±23	7.9±5.2
	7 days	2.14±0.6	9.4±3.4	92±36	3.6±4.8
	14 days	1.98±0.4	9.1±3.6	110±41	3.8±9.3
	28 days	1.88±0.5	8.9±3.0	120±40	3.5±3.4
≥37 weeks	Cord	1.41±0.3	9.2±1.9	60±35	6.7±4.8
	7 days	2.70±0.6	12.7±2.9	148±50	2.6±1.8
	14 days	2.03±0.3	10.7±1.4	167±31	2.5±2.0
	28 days	1.65±0.3	9.7±2.2	176±32	1.8±0.9

T4: thyroxine; T3: triiodothyronine; TSH: thyroid-stimulating hormone; SD: standard deviation.

Adapted with permission from: Williams FL, Simpson J, Delahunty C, et al. Developmental trends in cord and postpartum serum thyroid hormones in preterm infants. J Clin Endocrinol Metab 2004; 89:5314.

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خرید پکیج

Concentrations of free T4, T4, T3, and TSH in preterm and term infants in cord blood at birth and at 7, 14, and 28 days of age (mean±1 SD)