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This medical advice protocol has two top level parts: one for women and one for men.

For women, it says those over 40 should have the test. And it says no matter what your age, if either parent had diabetes you should have the test.

For men, it says only take the test if you are overweight.

We might be tempted to distraction by phrases like "no matter what" and "only" but a little bit of parsing and rephrasing helps to clarify.

COMMENTS

1. If you have crossing lines in your flow chart something is wrong.
2. You can have more than one action box for a single action — here "take the test" — in order to keep the chart well ordered.
3. Remember, single entry and single exit for each logical subunit.