Fix grammar errors: Since it's my first time doing it, I failed to collect 3ml of blood before it coagulated in the vessel.
I have no idea what the problem is.

I have a question:

I have a problem with the following:

I have a problem with the following:

I have a problem with the following:

I have a problem with the following:

I have a problem with the following:

I have a problem with the following:

I have a problem with the following:

I have a problem with the following:

I have
The blood was coagulated in the vessel before it was collected.
Corrected: The blood was coagulated in the vessel before it was collected.
Corrected: The blood was coagulated in the vessel before it was collected.
Corrected: The blood was coagulated in the vessel before it was collected.
Corrected: The blood was coagulated in the vessel before it was collected.
Corrected: The blood was coagulated in the vessel before