In these patients, however, free S‐25(OH)D was not a better measurement of vitamin D status than total S‐25(OH)D since both free and total S‐25(OH)D displayed the expected relationship with PTH only among those with normal serum albumin levels.32 In our population‐based cohort of white women, kidney and liver failure was rare; 0.4% had eGFR <30 mL/min and 0.7% had plasma albumin <35 g/L, and our estimates remained essentially the same after exclusion of subjects with low eGFR, low plasma albumin, and high ALAT levels. Here, PTH is linked to liver failure.