Reference Range

Sodium: All Ages:
136-145 mmol/L

Potassium:
0-8 days old:   3.2-5.5 mmol/L
8 days- 1 month old:   3.4-6.0 mmol/L
1-6 months old:   3.5-5.6 mmol/L
6 months-1 year old:   3.5-6.1 mmol/L
1-17 years old:   3.3-4.6 mmol/L
≥17 years old:   3.5-5.0 mmol/L

Chloride:
96-110 mmol/L

Glucose:
0-1 day old:   40-100 mg/dL
1-8 days old:   50-100 mg/dL
>8 days- Adult:   70-100 mg/dL

BUN:                              Male                     Female
1-8 days old:               <14 mg/dL              <14 mg/dL
8 days-1 month old:    <17 mg/dL              <16 mg/dL
1-4 months old:           <13 mg/dL              <15 mg/dL
4 months-1 year old:   <15 mg/dL              <14 mg/dL
1-4 years old:              5-17 mg/dL             5-17 mg/dL
4-14 years old:            7-17 mg/dL             7-17 mg/dL
14-18 years old:          8-21 mg/dL             8-21 mg/dL
>18 years old:            10-26 mg/dL           10-26 mg/dL

Hematocrit:                     Male                    Female
1-3 months old:              28.0-42.0%           28.0-42.0%
3-6 months old:              29.0-41.0%           29.0-41.0%
6 months-2 years old:    33.0-39.0%           33.0-39.0%
2-6 years old:                 34.0-40.0%           34.0-40.0%
6-12 years old:               35.0-45.0%           35.0-45.0%
12-18 years old:             37.0-49.0%           36.0-46.0%
≥18 years old:                39.5-50.2%           39.9-44.4%

<1 month old not established

pH:

Venous:  All ages   7.31-7.41

Arterial:    0-1 day old:   7.26-7.49

                1-7 days old:  7.29-7.45

                >7 days old:  7.35-7.45

PCO2:               Arterial                Venous

0-1 day old:      27-40 mm/Hg     27-40 mm/Hg

1-7 days old:    27-41 mm/Hg     27-41 mm/Hg

>7 days old:     35-45 mm/Hg     41-51 mmHg