Table 1.

Reference values for basal concentrations

	Reference values
TSH	0.4–3.5 mU/L (DxI)
fT4	8–14 pmol/L (DxI)
fT3	3.5–5.4 nmol/L (DxI)
Cortisol	≥400 nmol/L normal function
Cortisol (Synacthen test)	>550 nmol/L normal function
Estradiol	<600 nmol/L for follicular phase women
	200–2000 nmol/L for mid-cycle phase women
	300–1000 nmol/L for luteal phase women
	<150 pmol/L for post-menopausal women
FSH	2.5–10.0 U/L for follicular phase women
	4.0–14.0 U/L for mid-cycle phase women
	0.7–8.5 U/L for luteal phase women
	0.7–8.5 U/L for post-menopausal women
LH	1.8–12 U/L for follicular phase women
	18–90 U/L for mid-cycle phase women
	0.6–15 U/L for luteal phase women
	18–78 U/L for post-menopausal women
Testosterone	10–30 nmol/L for men
Prolactin	3–27 µg/L for age <50 years women
	3–20 µg/L for age >50 years women
	3–13 µg/L for men
IGF-1	250–610 μg/L for ages 18–19 years men
	210–600 μg/L for ages 18–19 years women
	250–590 µg/L for age 19–20 men
	220–550 µg/L for age 19–20 women
	160–420 µg/L years 20–25 years
	150–390 µg/L for ages 25–30 years
	140–370 µg/L for ages 30–35 years
	130–340 µg/L for ages 35–40 years
	120–320 µg/L for ages 40–45 years
	110–300 µg/L for ages 45–50 years
	110–270 µg/L for ages 50–55 years
	100–260 µg/L for ages 55–60 years
	90–240 µg/L for ages 60–65 years
	85–220 µg/L for ages >65 years
P-Sodium	137–145 mmol/L
Serum osmolality	280–300 mosmol/kg

P plasma, U unit