Last Saturday afternoon, I went to do agive blood donation. Last Saturday afternoon, I went to give blood

Donate blood is correct, but it is usual in the UK to refer to giving blood

Last Saturday afternoon, I went to do anate blood donation. Last Saturday afternoon, I went to donate blood.

Sounds more natural.

Last Saturday afternoon, I went to do a blood donation./I went for a blood donation. Last Saturday afternoon, I went to do a blood donation/I went for a blood donation.

My suggestion is quite colloquial in Australia and thus is grammatically sparse, if you don’t want to sound like this do not use it haha.

I caught a subway towards Hospital Sant Pau station; and yes, there is a station in the same hospital, in a corner.found the department where blood can be given in a corner of the hospital I caught a subway towards Hospital Sant Pau station; and found the department where blood can be given in a corner of the hospital

Where you can give blood is also correct, but it is better to use the passive "where blood can be given"

It was early afternoon, so when I arrived, there was nobody apart ofrom nurses and doctors. It was early afternoon, so when I arrived, there was nobody apart from nurses and doctors.

I´m being very pedantic here so forgive me, but for some reason in the UK we usually say "Doctors and Nurses" in that order.

It was early afternoon, so when I arrived, there was nobody apart ofrom nurses and doctors. It was early afternoon, so when I arrived, there was nobody apart from nurses and doctors.

But a bit later, people wasere arriving and I was accompanied by other donors. But a bit later, people were arriving and I was accompanied by other donors.

But a bit later, people wasere arriving, and I was accompanied by other donors. But a bit later, people were arriving, and I was accompanied by other donors.

But a bit later, people wasstarted to arrive/were arriving and I was accompanied by other donors. But a bit later, people started to arrive/were arriving and I was accompanied by other donors.

First of all, wWhen you first come in, you must fill in a form with a long list of questions, but it's easy to fill. When you first come in, you must fill in a form with a long list of questions, but it's easy to fill.

What you have written is correct, but my correction scans better

First of all, when you come in, you must fill in a form with a long list of questions, but it's easy to fill out. First of all, when you come in, you must fill in a form with a long list of questions, but it's easy to fill out.

First of all, when you come in, you must fill in a form with a long list of questions, but it's easy to fill out. First of all, when you come in, you must fill in a form with a long list of questions, but it's easy to fill out.

This list will be examined by a doctor who will haveask you some questions about the form. This list will be examined by a doctor who will ask you some questions about the form.

This list will be examined by a doctor, who will have you some questions about the form. This list will be examined by a doctor, who will have you some questions about the form.

This list will be examined by a doctor who will haveask you some questions about the form/your answers. This list will be examined by a doctor who will ask you some questions about the form/your answers.

Also, he or she will check you ther blood pressure. Also, he or she will check your blood pressure.

Also, they will check you ther blood pressure. Also, they will check your blood pressure.

Also, they will check you ther blood pressure. Also, they will check your blood pressure.

As all was ok, I was passed to next room where a nurse was waiting for me to doing the extractiontake the blood. As all was ok, I was passed to next room where a nurse was waiting for me to take the blood.

As all was ok, I passed towent to the next room where a nurse was waiting for me to doing the extraction. As all was ok, I went to the next room where a nurse was waiting for me to do the extraction.

As all was ok, I passed to/As all seemed well, I was passed onto the next room where a nurse was waiting for me to doing the extraction. As all was ok/As all seemed well, I was passed onto the next room where a nurse was waiting for me to do the extraction.

All went fine.well. All went well.

Now, in the next days, some persSomeone will receive my blood during the next few days. Someone will receive my blood during the next few days.

Now, in the next few days, some person will receive my blood. Now, in the next few days, some person will receive my blood.

Now, sometime in the next couple of/few days, somea person will receive my blood. Now, sometime in the next couple of/few days, a person will receive my blood.

Some times, I get a message ion my phone informing me that a patient haves received my blood. Sometimes, I get a message on my phone informing me that a patient has received my blood.

Some times, I get a message in my phone informing me that a patient haves received my blood. Sometimes, I get a message in my phone informing me that a patient has received my blood.

Some times, I get a message in my phone informing me that a patient haves received my blood. Sometimes, I get a message in my phone informing me that a patient has received my blood.