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Local and regional blood banks are particularly low on platelets and types O and Rh negative blood, the department said Wednesday.

If she is, the doctor must offer to administer her Rh immunoglobulin.

In addition, red blood cells may have a protein called Rh factor.

Alexander Wiener is a figure right out of a med school textbook: The award-winning physician helped discover the Rh factor in blood and advanced the fields of forensic medicine and serology.

In 1937, Landsteiner and Alexander Wiener identified another essential feature of blood, the Rh factor, which explained blood incompatibilities between certain mothers and fetuses—a leading cause of stillbirths at the time.