How important is a PSA test?

My dad has been offered a PSA test in the UK due to his age. For context his dad (my grandad) has a slow growing prostate cancer. The doctor said that the PSA test is probably unessasary and could make him worry about nothing. I am worried about the need to catch the disease early.

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Progesterone maintains pregnancy and it also used in contraceptive pills. Why? 

UnknownFemale reproductive system regulates the hormonal changes responsible for puberty and for an adults reproductive function. Dynamic integration of hormonal signals from the hypothalamus, pituitary, and ovary, result in repetitive cycles of follicle development, ovulation, and preparation of the endometrial lining of the uterus for implantation should conception occur. This could be by one extensive explanation , define a Normal Reproductive Function in women. Read More