5

After eating food or drinking beverage, we say a blessing; however, this is only the case if some minimum amount of food or beverage has been consumed.

Likewise, after going to the bathroom, we say a blessing. Is this blessing also dependent on the quantity of the waste released?

3

There is no minimum amount below which it is not considered "going to the bathroom" for the sake of making a blessing. The Shulchan Arukh addresses this question explicitly:

אֵין שִׁעוּר לְהַשְׁתִּין מַיִם כִּי אֲפִלּוּ לְטִפָּה אַחַת חַיָּב לְבָרֵךְ, שֶׁאִם יִסָתֵם הַנֶּקֶב מִלְּהוֹצִיא הַטִּפָּה הַהִיא הָיָה קָשֶׁה לוֹ וְחַיָּב לְהוֹדוֹת:‏

There is no specific amount of urinating required, because even if one urinates a single drop one must bless ["who created man/Asher Yatzar"], because one's opening may have been blocked from urinating that drop and so it may have been difficult for him, and so he is required to give thanks.

SA - OC 7:4

So if even a drop of urine is released, you should make the asher yatzar blessing.

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