In contrast, ADPKD bone ALP levels were lower in all four patients with PKD1‐T (9.6 μg/L), PKD1‐NT (6.8 μg/L), PKD2‐T (8.4 μg/L), and PKD2‐NT (9.6 μg/L). Here, PKD2 is linked to autosomal dominant polycystic kidney disease.