If an individual is an infrequent or first-time drug user, a hair follicle test may not detect drug use a few days before the test because it takes time for hair to grow. Employers need to weigh that fact into their choice of a drug test method. This test couldRead More →
It is uncommon for a woman to have a baby with Down syndrome or an open neural tube defect, and it is even more uncommon for a woman with a screen negative result, but it does sometimes happen. This is because the screening test cannot completely distinguish affected from unaffectedRead More →
Because there are thousands of genes, there are thousands of single gene disorders. This group of disorders cannot be diagnosed by a karyotype. In fact, if you were to perform karyotype on someone with a single gene disorder, no abnormalities would be detected. What can karyotyping not identify? Array CGHRead More →
Advances in the field of antenatal diagnosis have made possible the detection of profound sensorineural hearing loss prior to birth. Fetal motion in response to sound and auditory evoked potential testing can determine the presence of fetal hearing in the third trimester of pregnancy. What causes deafness during pregnancy? DeafnessRead More →
This defect happens at the end of the first month of pregnancy, when a baby’s spine and spinal cord (a bundle of nerves that runs down the center of the spine) are developing. Sometimes, the defect causes an opening in the back, which is visible. The spinal cord and itsRead More →
Intense itching is the main symptom of cholestasis of pregnancy. There is no rash. Most women feel itchy on the palms of their hands or the soles of their feet, but some women feel itchy everywhere. The itching is often worse at night and may be so bothersome that youRead More →