When morning sickness continues longer than it should, screening for hyperemesis gravidarum should be done to verify the condition and that the symptoms do not indicate a different problem such as hydatidiform mole.
Diagnosing hyperemesis gravidarum begins when symptoms of nausea and vomiting continue after the first trimester of pregnancy. The medical history will be established and a physical exam performed that may reveal low blood pressure accompanied by a high pulse. The doctor will prescribe a hematocrit, a blood test, and urine ketones test to check for signs and amounts of dehydration. Additional tests used in diagnosing hyperemesis gravidarum check for gastrointestinal and liver problems.
A hormone test showing too high blood levels of HCG (human chorionic gonadotropin) may indicate multiple fetuses or may indicate the presence of a hydatidiform mole. A pelvic exam and an ultrasound can rule out these possibilities, helping narrow the diagnosis to hyperemesis gravidarum.