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Table 3 Comparison of IDMS measurements and Point-of-Care i-STAT CHEM8+ measurements by season

From: Pilot study determining the feasibility of implementing the Disadvantaged Populations eGFR Epidemiology Study (DEGREE) protocol, point-of-care field measurements and a new module on risk factors for chronic kidney disease of unknown origin in Hispanic outdoor workers

Blood Chemistries

Colder Period (n = 24)

Hotter Period (n = 26)

IDMS

iSTAT

   

IDMS

iSTAT

   

Mean (SD)

Mean (SD)

Percent Difference

(%)

r

Bias

Mean

(95%CI)

Mean (SD)

Mean (SD)

Percent Difference

(%)

r

Bias

Mean

(95%CI)

Hemoglobin (g/dL)

16.03 (1.21)

16.86 (1.12)

5.05

0.878

0.833 (0.60/1.06)

15.47 (1.220)

15.85 (1.221)

2.43

0.868

0.388 (0.14/0.64)

Creatinine (mg/dL)

0.88 (0.13)

0.89 (0.15)

1.13

0.896

0.013 (−0.018/0.045)

0.95 (0.1361)

0.965 (0.1788)

1.57

0.914

0.013 (−0.015/0.39)

BUN (mg/dL)

12.83 (3.82)

13.25 (4.34)

3.22

0.964

0.35 (− 0.049/0.74)

13.46 (3.08)

13.81 (3.86)

2.57

0.986

0.42 (−0.095/0.93)

eGFR (ml/min/1.73m2)

114.00 (15.18)

–

 

–

 

105.81 (18.21)

–

 

–

 
  1. IDMS Isotope dilution mass spectrometry; SD Standard deviation; BUN Blood urea nitrogen; eGFR Estimated glomerular filtration rate; r = Pearson’s correlation coefficient
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