The clinical significance of acidity and alkalinity is related to the test specimen. Testing blood can provide insight into the presence of acidosis, alkalosis, and electrolyte disturbances. Vaginal discharge testing can assist in disease diagnosis and is more commonly used to assist in the diagnosis and treatment of inflammatory diseases of the female genital tract, such as senile vaginitis in older women who are post-menopausal. The pH of vaginal discharge can indicate the type of inflammation and determine what kind of infection is present. A woman does not need a pH test before pregnancy. Eugenics testing is required before pregnancy to look for fertility risks for both spouses.