Fetal Blood Testing
Alternate Names : Fetal Scalp Blood, Scalp pH Testing
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How is the Test Performed?
The procedure typically takes about 5 minutes. You will be placed in the lithotomy position (on your back with your knees and legs pulled toward your chest). If your cervix is already dilated at least 3 to 4 centimeters, a plastic cone is placed in your vagina and fit snuggly against the scalp of the fetus.
The scalp is cleansed and dried with long cotton swabs, and a small amount of petroleum jelly is applied so the blood droplets will form beads for easier collection. A small puncture is made in the scalp and blood droplets are collected in a thin tube. The tube is either sent to the hospital laboratory or analyzed by a machine in the labor and delivery department. In either case, results are available in just a few minutes.
If you are unable to be still, it will be very difficult to perform this test. If your cervix is not dilated enough, it is impossible to perform this test.
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