Table 4: Stability of serum in RSTs over 4 days indicated by repeat testing.

AnalyteUnitsRange*D1**   D2**   D3**   D4**   ANOVA

Ureammol/L2.3, 754.24 (0.21)4.17 (0.20)4.13 (0.19)4.07 (0.22)NS
Creatinine mol/L47, 10872.0 (2.80)75.2 (2.91)76.7 (3.03)75.5 (2.88)NS
Bicarbonatemmol/L22.0, 28.525.3 (0.31)18.8 (0.39)16.9 (0.25)16.9 (0.30)d2, d3, d4
Glucosemmol/L3.5, 9.04.97 (0.19) 5.06 (0.19) 5.16 (0.22) 5.21 (0.31) NS
Sodiummmol/L135, 144140 (0.40)143 (0.49)147 (0.53)148 (0.78)d3, d4
Potassiummmol/L3.4, 5.04.1 (0.05)4.2 (0.05)4.4 (0.07)4.4 (0.08)d3, d4
Chloridemmol/L101, 107104 (0.32) 105 (0.40) 107 (0.37) 109 (0.51) d3, d4
Total Proteing/L60, 8071.0 (0.74)72.2 (0.74)73.6 (0.97)73.4 (1.14)NS
Albuming/L34, 4438.8 (0.45)39.1 (0.49)40.7 (0.53)41.4 (0.63)d3, d4
Total Bilirubinµmol/L4.4, 23.59.69 (0.89)8.95 (0.81)8.79 (0.79)8.26 (1.05)NS
ALPU/L39, 33173.4 (10.7)75.9 (11.3)81.8 (12.9)95.8 (19.6)NS
ALTU/L7, 3616.4 (1.22)16.1 (1.12)15.3 (1.24)16.0 (1.60)NS
ASTU/L10, 2615.6 (0.71) 16.2 (0.70) 16.7 (0.85) 18.1 (1.11) NS
Cholesterolmmol/L3.17, 6.274.84 (0.14)4.91 (0.14)4.99 (0.16)4.89 (0.20)NS
HDLmmol/L0.79, 2.751.47 (0.06)1.46 (0.06)1.51 (0.07)1.52 (0.10)NS
Triglyceridesmmol/L0.42, 2.881.18 (0.10) 1.22 (0.10) 1.26 (0.11) 1.33 (0.16) NS
TSHmU/L0.487, 6.201.889 (0.21)1.893 (0.21)2.010 (0.24)2.360 (0.34)NS
fT4pmol/L8.7, 14.611.3 (0.24) 10.9 (0.24) 11.1 (0.26) 11.2 (0.36) NS
CK-MB g/L0.88, 4.821.80 (0.15)1.88 (0.14)1.65 (0.14)1.61 (0.21)NS
NT-proBNPpg/mL5.0, 100.635.9 (4.98)37.3 (4.97)37.9 (5.28)47.5 (7.00)NS

Range: minimum, maximum.
D1: day 1, D2: day 2, D3: day 3, D4: day 4.
Result: mean (SD).
d2, d3, d4: .
Note: same stability shown on SST tubes.