Blood Test Tells You How Long You Will Live
The controversial test measures vital structures on the tips of a person's chromosomes, called telomeres, which scientists believe are one of the most important and accurate indicators of the speed at which a person is ageing.
Scientists behind the $700 test said it will be possible to tell whether a person's "biological age", as measured by the length of their telomeres, is older or younger than their actual chronological age.
Medical researchers believe that telomere testing will become widespread within the next five or 10 years, but there are already some scientists who question its value and whether there should be stronger ethical controls over its wider use. In addition to concerns about how people will react to a test for how "old" they really are, some scientists are worried that telomere testing may be hijacked by unscrupulous organisations trying to peddle unproven anti-ageing remedies and other fake elixirs of life.
The results of the tests might also be of interest to companies offering life-insurance policies or medical cover that depend on a person's lifetime risk of falling seriously ill or dying prematurely. However, there is a growing body of scientific opinion that says testing the length of a person's telomeres could provide vital insights into the risk of dying prematurely from a range of age-related disorders, from cardiovascular disease to Alzheimer's and cancer. "We know that people who are born with shorter telomeres than normal also have a shorter lifespan. We know that shorter telomeres can cause a shorter lifespan," said Maria Blasco of the Spanish National Cancer Research Centre in Madrid, who is the inventor of the new commercial telomere test. "But we don't know whether longer telomeres are going to give you a longer lifespan. That's not really known in humans," she added.
"What is new about this test is that it is very precise. We can detect very small differences in telomere length and it is a very simple and fast technique where many samples can be analysed at the same time. Most importantly, we are able to determine the presence of dangerous telomeres – those that are very short."
Dr Blasco's company, Life Length, is in talks with medical diagnostic companies across Europe, including the UK, to market the test and collect blood samples for analysis in Spain. A deal with a company operating in Britain is likely within a year, she said.
"We need to have a clinical company to send us the blood [samples]. We are in contact with several groups in the UK who are interested," Dr Blasco said.
Life Length is anticipating hundreds of requests from people wanting to have their telomeres tested and is expecting demand from thousands more once the company is able to bring down the cost of the test as public demand increases.
Although Life Length is not the only company selling telomere tests, it is the only one gearing up for over-the-counter sales to the public and the only company with an accurate-enough test to be of practical use, said Professor Jerry Shay of the University of Texas Southwestern Medical Centre in Dallas.
"This test devised by Blasco is so accurate that it is likely to provide more useful information than some of the other tests out there right now," said Professor Shay, who is a scientific consultant for Life Length. "What's important in ageing is the shortest telomeres. What makes cells stop growing is the shortest telomeres, not the average telomere length, which is what other tests look at.
"Everyone talks about the chronological age, but there is also a biological age, and telomere length is actually a pretty good representation of your biological age. Telomeres are important – there is no question of that," he said.