You'll need to
report this income on your return, even if you didn't receive a tax document
for it.
Income for
participating in a clinical trial or medical study is taxable, but if this
activity is infrequent, which would appear to be your situation, the income
wouldn't be subject to self-employment income tax.
Please see
TurboTaxTeresaM's previous answer, below, for TurboTax entry guidance. The "If you did not receive a Form
1099-MISC" header would apply to your situation.
https://ttlc.intuit.com/replies/6097880
