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Hello, this is Dr. Salama MD,
The initial testing needs be a total testosterone level checked between 8-11am. Only if it is low (<200) would you need confirmatory testing with other blood tests.
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The testosterone solo is the total testosterone and will definitely be cheaper than the panel. If it comes back normal you will need any further testing. If it is low, then order the panel afterwards.
Is there anything else I can help you with?