The diagnosis is one of exclusion, meaning other possible sources of vaginal bleeding or abdominal pain have to be ruled out in order to diagnose placental abruption. Of note, use of magnetic resonance imaging has been found to be highly sensitive in depicting placental abruption, and may be considered if no ultrasound evidence of placental abruption is present, especially if the diagnosis of placental abruption would change management. Classification
Based on severity:

Class 0: Asymptomatic. Diagnosis is made retrospectively by finding an organized blood clot or a depressed area on a delivered placenta. Class 1: Mild and represents approximately 48% of all cases. Characteristics include the following:
No vaginal bleeding to mild vaginal bleeding
Slightly tender uterus
Normal maternal blood pressure and heart rate
No coagulopathy
No fetal distress
Class 2: Moderate and represents approximately 27% of all cases. Characteristics include the following:
No vaginal bleeding to moderate vaginal bleeding
Moderate-to-severe uterine tenderness with possible tetanic contractions
Maternal tachycardia with orthostatic changes in blood pressure and heart rate
Fetal distress
Hypofibrinogenemia (i.e., 50–250 mg/dL)
Class 3: Severe and represents approximately 24% of all cases. Characteristics include the following:
No vaginal bleeding to heavy vaginal bleeding
Very painful tetanic uterus
Maternal shock
Hypofibrinogenemia (i.e., <150 mg/dL)
Coagulopathy
Fetal death

Prevention
Although the risk of placental abruption cannot be eliminated, it can be reduced. Avoiding tobacco, alcohol and cocaine during pregnancy decreases the risk. Staying away from activities which have a high risk of physical trauma is also important.
In another example, the healing form Eight Pieces of Brocade (Baduanjin qigong) is based on a series of static postures.Meditative practiceutilizes breath awareness, visualization, mantra, chanting, sound, and focus on philosophical concepts such as qi circulation, aesthetics, or moral values. In traditional Chinese medicine and Daoist practice, the meditative focus is commonly on cultivating qi in dantian energy centers and balancing qi flow in meridian and other pathways. In various Buddhist traditions, the aim is to still the mind, either through outward focus, for example on a place, or through inward focus on the breath, a mantra, a koan, emptiness, or the idea of the eternal. In the Confucius scholar tradition, meditation is focused on humanity and virtue, with the aim of self-enlightenment.Use of external agentsMany systems of qigong practice include the use of external agents such as ingestion of herbs, massage, physical manipulation, or interaction with other living organisms. For example, specialized food and drinks are used in some medical and Daoist forms, whereas massage and body manipulation are sometimes used in martial arts forms. In some medical systems a qigong master uses non-contact treatment, purportedly guiding qi through his or her own body into the body of another person. Forms
There are numerous qigong forms. 75 ancient forms that can be found in ancient literature and also 56 common or contemporary forms have been described in a qigong compendium. : 203–433  The list is by no means exhaustive. Many contemporary forms were developed by people who had recovered from their illness after qigong practice.