Are Stool Tests For Three Consecutive Days Required To Assess Blood In Stool?

Question: i had black stool three days before , and i went to the doctor and he clearly wrote in the prescription that OB test-stool 3 consecutive days but when i went to lab they only asked for stool sample of next morning and gave me my report saying STOOL ROUTINE EXAMINATION AND WHEN I ASKED ABOUT WHY THE TEST I REQUESTED AND THE ONE DONE ARE DIFFERENT THEY SAID THAT THE BILLING WAS DONE IMPROPERLY AND. THEN THE REBILLING WAS DONE AND I WAS CHARGED 30 RS MORE AND THEY SAID TO ME THE THAT THE TEST DONE WAS REQUESTED ONE ONLY BUT THE BOY SITTING AT COUNTER MADE A WRONG XXXXXXX , THE TEST COSTED ME AROUND 100RS+ OR - DON'T REMEMBER IN THE REPORT IT WAS MENTIONED RBC COUNT - NIL AND MUCUS + AND SOME MORE THINGS WERE MENTIONED UNDER MICROSCOPIC EXAMINATION , AND WHEN I WENT TO DOCTOR WITH MY ENDOSCOPY ULTRASOUND AND THE STOOL REPORT HE TOLD ME EVERYTHING'S FINE ITS JUST MILD GASTRITIS BUT I HAVE DOUBTS ON MY STOOL TEST HOW COULD A THREE DAY CONSECUTIVE TEST WAS DONE IN ONE DAY SHOULD I JUST RELAX OR SHOULD GO AND GET MY TEST DONE AGAIN ?