by Anne Marie Helmenstine, Ph.D. Updated June 13, 2014. Definition: A molecular orbital is an orbital or wavefunction of a molecule's electron. Electrons around a molecule can be associated with more than one atom and are often expressed as a combination of atomic orbitals.
Hereditary angioedema is a disorder characterized by recurrent episodes of severe swelling (angioedema). The most common areas of the body to develop swelling are the limbs, face, intestinal tract, and airway. Minor trauma or stress may trigger an attack, but swelling often occurs without a known trigger.
Symptoms and Diagnosis Hereditary angioedema can take a long time to diagnose, because HAE symptoms may resemble other conditions, such as allergies or stomach problems. How doctors diagnose hereditary angioedema. A series of blood tests that measure levels of serum C4 and C1-INH proteins are needed to confirm the disease.