Table 3. Reference ranges of three vitamin K's forms.

Phylloquinone	Menaquinone-4 n = 191	Menaquinone-7 n = 191
0.044–1.357 ng/mL (women, n = 149) 0.03–1.214 ng/mL (men, n = 42)	0.050–1.598 ng/mL	0.074–0.759 ng/mL