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Step 1
Go to a sports science lab and have your lactate threshold tested there. This will probably be expensive, but many would argue that it will give you the most accurate result.
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Step 2
Consider purchasing a self-test kit. These are easy to order online, but they're also very expensive. If you're bent on getting a lactate measurement directly from your blood, this might be the best way to go.
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Step 3
Determine the pace you could run at for an hour. This is a good way for you to come up with a (very) rough estimate of the speed at which you'll reach your lactate threshold.
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Step 4
Calculate an estimate of your threshold using an online calculator. These are based on the results of a race, and though not as accurate as blood testing, they will give you a pretty good idea of where your threshold is.
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Step 5
Ride or run your best 30-minute time and record your heart rate during the last 20 minutes. Your average heart rate during this time will closely match your heart rate at lactate threshold. This is one of the most useful estimates available, since heart rate monitors are reliable, easy to use and relatively inexpensive.
