Stillbirth The age at which fetal demise is legally classified asa a miscarriage varies between countries with the US being 20 gestational weeks and the UK being 24 gestational weeks. The HPO chooses the average of these age ranges. UMLS:C0595939 Foetal demise UMLS:C0015927 Fetal demise HP:0003826 SNOMEDCT_US:276507005 Foetal death Death of the fetus in utero after at least 22 weeks of gestation. Fetal death SNOMEDCT_US:237364002 Stillborn Late foetal death HP:0001625 Late fetal death HP:0001624 Stillbirth Prenatal death