At what age should Nigerian women go for cervical cancer screening?

Didn't know how scary this cervical cancer is, until today when I read about a 22 year old lady who lost her womb due to late detection of Cervical Cancer.
I know Cervical screening is not a test for cancer. It is a method of preventing cancer by detecting and treating early abnormalities which, if left untreated, could lead to cancer in a woman's cervix (the neck of the womb). 
The screening test involves a nurse or doctor taking a small sample of cells from the surface of your cervix. They do this by putting an instrument called a speculum inside your vagina and then scraping the cervix with a small brush. They put the brush and cells into a small pot of liquid and send it to the laboratory. This is called liquid based cytology. In the lab, your sample is put under a microscope. The cells are examined and any abnormal ones reported.
If you are between the ages of 25 and 60 in the UK, you will be contacted every 3 to 5 years and asked to go for a cervical screening test. In England, women between 25 and 64 years are screened. Currently in Northern Ireland and Wales, women between 20 and 64 are screened. In Scotland, women between 20 and 60 are invited for screening.
So in Nigeria, at what age do women go for screening? 



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