Ms Shisgal was just 15 when she went out on her first shift. "It is what we do," she says matter-of-factly. "Going into the ambulance service is like a club. It is part of how we socialise and how our society works."
Having spent two years in the army, she is working as a vet's assistant while "deciding what I want to do with my life. I used to do three or four shifts a week. But now I have a full-time job, I only do one or two."
She adds, laughing: "Can you think of anywhere else in the world where this would work?" Whereas young people elsewhere were thinking about university or clothes, "in Israel we have other things to think about".
Attending to Avi is the first call of Ms Shisgal's 12-hour shift. Once his condition is stabilised, she and her two colleagues put him on to a stretcher and into the back of an ambulance donated by UK Friends of MDA.
Contributions from the UK - where £3 million is raised annually - and other international communities are crucial as MDA does not receive state support. Mr Golan-Gutin explains that "while treatment and ambulance call outs are covered by Israel's health insurance companies and tax people pay out of their wages, we rely on funding from the diaspora. We get roughly 100 million shekels [£17 million] a year through charity.
"They buy our ambulances, our uniform, the blood centres. We are very lucky because without that we wouldn't be able to function."
Ms Shisgal says that MDA's equipment "is still the best. Every ambulance has a GPS fitted. The dispatcher knows which ambulance is under his responsibility. If we are on our way back from somewhere and we happen to be near an emergency that isn't in our jurisdiction, the dispatcher can see it and send us there.
"We can send real time updates of the patient to the hospital, so what you see the hospital can also see. They know what to expect. And every dispatch centre also has an in-house doctor who can see the real time status of the patient. It means they are on hand to the team to give advice about the patients if needed."
The driver on Ms Shisgal's shift is Harel Sasson, 27, one of MDA's paid staff. Turning on the flashing lights, he zig-zags at speed through the Tel Aviv traffic as trainee paramedic Yoav Leibovitz, 25, monitors Avi's condition.
"Sometimes the most effective treatment we can give someone is to get them to the hospital in the quickest time," Mr Sasson says as the vehicle mounts a pavement to break through the gridlock. "There is no official training for driving an ambulance and you can see people here don't move out of the way. I don't know what it is with Israelis."
For Mr Leibovitz, the shift is part of a training process he hopes will lead him to becoming a military paramedic. He says his MDA duties are preparing him for a job in combat zones.
"It is a fact we have terror attacks every day. Our friends have been attacked attending calls. And with the stabbings happening now, it is good for us to see first-hand, so when we are in the battlefield we know how to deal with things."
Two weeks previously, he had treated a young woman in Jaffa who had been shot in the chest during a family dispute. He managed to keep her alive but she later died in surgery. "When she passed away, the doctors came out and talked to us. You obviously think: 'Is there anything you did wrong?' We talked about it and we agreed we did everything we could and I'm okay with it."
It was hard not to be emotional in such cases "but we can deal with it. We have each other to speak about what happens."
Asked if he is ever scared, Mr Leibovitz replies: "Of course we have to consider our own safety. When we go to a house, we have to see what it is like. In the case of Avi, we can see it is a regular house with no threat. But sometimes we call the police before we go inside."
Because of army and MDA commitments, he has not had the opportunity to go to university but has no regrets. "Other people do not need to fight for their independence in their country. Some people need to be the ones who take care of the people in their country. That is us and we are proud to do it."
In five years, Ms Shisgal has seen "everything from suicide to car accidents. But for me, the worst thing is the social cases.
"Medically you might treat someone and they are okay but they live in a one bedroom house and it is dirty and in a terrible condition. They have no money and they are alone.
"My mum says I'm a robot. I come back and tell her about the things I've seen, people getting stabbed, and she is like: 'How are you okay with it?'
"But she doesn't worry about me doing this job. She worries about a lot of things, but not that one."
It is MDA policy to prioritise those in the greatest medical need and there was outrage when Israeli media reported that MDA staff gave lifesaving treatment to a terrorist before the Jewish victim.
"Sometimes it is the terrorist who has to get the treatment first," Mr Leibovitz acknowledges. "Do I want to treat him? No, but I have to and I do. And I do my best to save the life of whoever I get to.
"I had to go to a stabbing the other day. The victim had been hurt in his arm - it was not life threatening - but the terrorist had been shot. So we went to help him first. You just get on with it."
Mr Golan-Gutin notes the "backlash from some people who don't understand how you can treat a terrorist before the victim. But they have to understand we are not the judge and jury.
"This is a democracy. We don't come to the patient and say: 'You are the Arab terrorist, you die.' It is not for us to decide who gets treatment or not and that is the right way to look at it, even if it hurts.
"We have Arabs, Israelis, Druze, Bedouins, Christians all working together. It is unique to us as an organisation. It works because everybody works towards one cause. It is a beautiful thing."
Mr Leibovitz says that MDA also helps the Palestine Red Crescent, its equivalent in the Palestinian territories.
"We can't operate there, but if a patient needs to go to an Israeli hospital, they come to the army on the border and we take the patient for treatment. There is a lot of working together but people don't want to see that."
And Avi? He was fine.
