Dozens of private sector companies are competing to offer blood tests to patients for a variety of purposes—particularly screening. As the cost of consumer testing falls, we highlight several areas of concern.In the UK, regulation prevents prescription only medications being advertised directly to consumers, but not medical tests. The BMJ’s investigation has found dozens of companies offering health screening for a range of conditions and deficiencies through blood testing kits for use at home, often advertised to people with symptoms such as tiredness, low energy, irritability, sleep problems, and problems with weight.1Symptomatic testing should not begin with pick and mix blood testing but with history taking, possible examination, and decisions on whether any test is necessary and beneficial. Pre-test probabilities are required to interpret and plan action on the basis of the test results. Patients should be informed that “normal” results may not provide complete reassurance or predict an outcome…

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