[Study of potassium, sodium and calcium serum levels in pregnant women and placental potassium and sodium at the time of normal and prolonged labor].
D002118:Calcium / Q000097:blood*; D005260:Female; D006801:Humans; D007744:Obstetric Labor Complications / Q000378:metabolism*; D010920:Placenta / Q000032:analysis*; D011188:Potassium / Q000032:analysis* / Q000097:blood; D011247:Pregnancy; D012964:Sodium / Q000032:analysis* / Q000097:blood
D012964:Sodium; D011188:Potassium; D002118:Calcium
Prouchvane nivoto na kaliia, natriia i kaltsiia v seruma na bremennata i na kaliia i natriia v platsentata po vreme na normalno i ud"lzheno razhdane.