Concentration Ranges of Commonly Measured Variables in Blood
Traditional units
SI units
Blood gases
P
O
2
(arterial)
80–100 mmHg
11–13 kPa (kilopascals)
(
Note:
P
O
2
declines with age, being close to 100 mmHg in childhood, and decreasing to 80 and even lower in old age.)
P
CO
2
(arterial)
35–45
mmHg
4.7–5.9 kPa
Electrolytes
Ca
2+
Total
9.0–10.5 mg/dL
2.2–2.6 mmol/L
Ionized
4.5–5.6 mg/dL
1.1–1.4 mmol/L
Cl
97–110 mmol/L
K
+
3.5–5.0 mmol/L
Na
+
135–146 mmol/L
Hormones
Aldosterone
30–100 pg/ml
83–277 pmol/L
Cortisol
8:00
A
.
M
.
5–25 μg/dL
140–690 nmol/L
4:00
P
.
M
.
1.5–12.0 μg/dL
40–330 nmol/L
Estradiol
Women (early follicular phase)
20–100 pg/ml
73–367 pmol/L
Women (midcycle peak)
150–750 pg/ml
551–2753 pmol/L
Men
10–50 pg/ml
37–184 pmol/L
Insulin
(fasting)
6–26 μU/ml
43–186 pmol/L
(0.2–1.1 ng/ml)
Insulin-like growth hormone-1 (IGF-1)
16–24 years old
182–780 ng/ml
182–780 μg/L
25–50 years old
114–492 ng/ml
114–492 μg/L
Parathyroid hormone
10–75 pg/ml
10–75 ng/L
Progesterone
Women (luteal phase)
2–27 ng/ml
6–81 nmol/L
Women (pregnancy)
5–255 ng/ml
15–770 nmol/L
Men
0.2–1.4 ng/ml
0.6–4.3 nmol/L
Testosterone
Women
<1ng/ml
<3.5 nmol/L
Men
2.5–10.0 ng/ml
9–35 nmol/L
Thyroid-stimulating hormone (TSH)
0.3–4.0 μU/ml
0.3–4.0 mU/L
Thyroxine (T
4
)
(adults)
5–11 μg/dL
64–140 nmol/L
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