A VDRL reactive mother gave birth to an infant. All of the following would help in determining the risk of transmission to the infant except -
TPHA test on the serum sample of the mother:
Indicates mother has syphilis. But it doesn’t say about the congenital syphilis. Moreover, TPHA remains elevated even after treatment. So, an adequately treated mother before 4th month of gestation has a very less risk of transmission but can still have an elevated TPHA.
TPHA test on the serum sample of the mother
TPHA test on the serum sample of the infant
VDRL on the paired serum sample of the infant and mother
Time interval between the treatment of the mother and her delivery