Getting blood drawn is a routine part of hospital care, but for older adults on blood thinners, it often leads to painful, unsightly bruises. A new study asked a simple question: does holding pressure on the spot longer make a difference? Researchers tested this with 164 hospitalized older adults (average age 76) who were taking anticoagulants. They compared applying firm pressure for one, three, or five minutes after the needle was removed against a control group where the pressure duration wasn't specified.
The results were clear. At 24, 48, and 72 hours after the blood draw, people in the control group were significantly more likely to have bruises. In fact, 14% of people in the control group developed a bruise at least one centimeter squared in size at all three checkpoints. That rate was 'significantly higher' than in any of the groups that received the planned pressure.
The study's conclusion points to five minutes of pressure as being effective. However, there are important details we don't know from the published abstract. We don't know exactly how much pressure the control group received, or how the one-minute and three-minute groups specifically compared to each other. The study also didn't report on any safety issues or discomfort from holding pressure. While this strong evidence supports taking that extra time, more details would help pinpoint the minimum effective duration.