Table 3.

Umbilical venous and arterial amino acid concentrations (μM). Data are mean ± sem

Amino acid	Cases delivered <48 hours form B			Cases delivered ≥ 48 hours form B			Controls
	Umb vein	Umb Art	p	Umb vein	Umb Art	p	Umb vein	Umb Art	p
Arginine	129.5 ± 5	110.6 ± 8.4	0.01	112.8 ±	116.9 ± 8.6	0.7	110 ± 7.5	102.2 ± 4.7	0.01
Phenylalanine	77.3 ± 3.8	74.6 ± 2.4	0.3	64.6 ± 4.6	66.8 ± 3.4	0.3	65.5 ± 1.6	63.6 ± 2.1	0.05
Lysine	375.7 ±26.4	353.7 ± 22.9	0.06	378.9 ±	396.5 ± 26.5	0.2	345.1 ± 10.9	319.1 ± 10.2	0.001
Histidine	104.9 ± 5.4	97.8 ± 4.4	0.05	123.1 ±	128.9 ± 20.8	0.2	119.6 ± 3.4	108.4 ± 3.1	0.001
Methionine	40.8 ± 2.3	37.5 ± 2.4	0.1	30.9 ± 4.7	35.8 ± 2.1	0.2	25.4 ± 0.9	24.6 ± 1.1	0.1
Threonine	362.6 ± 27	366.5 ± 30	0.7	365.3 ±	373.1 ± 26.5	0.5	276.1 ± 16.4	265.3 ± 16.5	0.01
Valine	257.5 ± 9.1	242.8 ± 8.7	0.04	203.4 ±	212.1 ± 10.3	0.1	218.3 ± 8.1	202.3 ± 7.9	0.001
Leucine	141.8 ± 6.7	129.1 ± 5.6	0.01	103.5 ±	113.3 ± 4.7	0.02	120.3 ± 4.6	105.8 ± 3.9	0.001
Isoleucine	88.8 ± 4.8	70.8 ± 8.7	0.1	61.9 ± 5.2	69.4 ± 5.4	0.05	64.1 ± 3.2	56.6 ± 2.9	0.001
Serine	169.7 ± 7.3	180.3 ± 10.1	0.02	162.5 ±	157.9 ± 7.8	0.1	142.8 ± 4.2	145.3 ± 4.2	0.1
Glycine	314.7 ± 28.2	326.3 ± 28.5	0.3	292.8 ±	289.9 ± 17	0.6	219.8 ± 8	220.1 ± 9.1	0.9
Alanine	510.1 ± 33.6	475.9 ± 31.7	0.03	400.8 ±	442.9 ± 50.7	0.02	286.3 ± 12.3	241.8 ± 10.2	0.001
Glutamine	768.7 ± 53.7	763 ± 50.9	0.8	555 ±	546.7 ± 36.6	0.7	495.7 ± 10.9	485.3 ± 13.5	0.2
Glutamate	50.5 ± 11.4	78.4 ± 18.7	0.05	73 ± 15	54.7 ± 9.8	0.2	27.5 ± 7.7	43 ± 6.5	0.01
Proline	234.4 ± 19.8	220.3 ± 29	0.2	219.3 ±	230 ± 24	0.3	157.1 ± 5.2	143.9 ± 6.4	0.01
Taurine	89.6 ± 6.9	103.9 ± 7.6	0.2	84.5 ±	80.3 ± 7.4	0.7	96.1 ± 5.6	107.3 ± 11.7	0.3
Tyrosine	69.8 ± 3.4	70.5 ± 3.4	0.7	66.2 ± 5.6	67.4 ± 4.4	0.6	59.9 ± 2	60 ± 2.3	0.9

B: betamethasone