Some examples of substrates used (also known as chromogens) are AEC (3-Amino-9-EthylCarbazole), or DAB (3,3'-Diaminobenzidine). Use of one of these reagents after exposure to the necessary enzyme (e.g., horseradish peroxidase conjugated to an antibody reagent) produces a positive immunoreaction product.
1. Know When You Ovulate after Childbirth. Most women experience an extended period of bleeding immediately after giving birth. The bleeding will get lighter and lighter, lasting about six weeks. It is extremely unlikely that a woman will become pregnant during this time, although it is not impossible.
Postpartum bleeding is generally much heavier than menstrual bleeding, however. Postpartum bleeding typically begins within hours after giving birth, and will continue for about two or three weeks after giving birth. For some women, postpartum bleeding may last for up to as many as six weeks after giving birth. Postpartum bleeding starts out as a bright red vaginal discharge. The postpartum bleeding generally stays bright red for anywhere from four to ten days after giving birth. After that time, the color will become more pinkish, and eventually becomes an off-white or yellow-white color.