If there's one thing I've always said about Lisa, it's that she has the body of a 37-year-old. Which proved quite offensive when I first met her. But fortunately a lot's changed since then. Most notably her age.

We received a letter this morning with the results of Lisa's Maternal Serum Biochemistry Study. Otherwise known as the blood test she had last Thursday. They use it in conjunction with the nuchal scan to calculate the risk of your baby having Down's Syndrome and other less desirable conditions.

A woman of Lisa's advanced years has, on average, a 1 in 55 chance of giving birth to a baby with Down's, but having examined her blood and scan results over the past couple of days, they've estimated her risk for this pregnancy at just 1 in 201. Which is what you'd expect for a lady five years her junior. Frankly she has the Pregnancy Associated Plasma Protein-A and Free ß-Human Chorionic Gonadotrophin levels of someone in their mid-thirties. Like me, for example. If I was female. And pregnant.

It's particularly ironic, because I have the arthritis and prostate of a pensioner. But between us, we have a good chance of raising a healthy child.