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Understanding the power of blood

From hospitals to hymn books, it's significant for a reason.

Helen is a registered nurse and freelance writer, writing for audiences ranging from the general public to practitioners and scientists.

A bag of blood connected to a drip.
Give blood.
Aman Chaturvedi on Unsplash.

With one billion molecules of oxygen packed into each of your 30 trillion red blood cells, blood is sometimes known as the red river of life. Countless lives have been saved through blood transfusion, but why, throughout history, across continents and cultures, has there been a special interest in the blood of one man crucified 2,000 years ago, believing it alone to have “wonder-working power”?  

Whether you are a newborn baby with half a pint of blood, or an adult with nearer nine pints, “what is certain is that you are suffused with the stuff”, writes author Bill Bryson in his book, The Body.  

Once thought to ebb and flow in waves like the sea, from the liver to other organs, having been heated in the heart, blood in fact flows in a network of vessels measuring some 60,000 miles, with the heart acting as pump, not heater. Cleverly conserved through a complex system of blood-clotting in the case of injury, blood is a precious resource that needs replacing if lost in large amounts. Victims of road traffic accidents can require up to fifty units of blood; significant amounts are needed for organ transplantation, severe burns or heart surgery. 

The first human blood transfusion in Britain, using blood from a lamb, was performed by Dr Richard Lower in 1667, given not to replace blood loss but to change character: could the old be made young, the shy be made sociable through blood transfusion? Apparently not.  

Safe transfusion awaited the discovery of blood types by Dr Karl Landsteiner in the early 20th century. Today, NHS Blood and Transplant deliver 1.4 million units of red cells to 260 hospitals each year for transfusion; about 85 million units are transfused worldwide, given to replace blood loss after accident, surgery, ulcer, ectopic pregnancy or for anaemia in cancer. Also used to boost blood cell numbers in malaria, sepsis, HIV, leukaemia and sickle cell anaemia, blood transfusion is now amazingly safe. Fatal reactions are extremely rare, “occurring only in one out of nearly two million transfusions”, writes physician Dr Seth Lotterman. “For comparison, the lifetime odds of dying from a lightning strike are about 1 in 161,000,” he adds. The risk of HIV infection has dropped dramatically, to less than one in seven million. 

History tells though of the danger of transmitting disease from the blood donor during transfusion. The World Health Organization recognises risk of infection with HIV, hepatitis, syphilis, malaria, and Chagas disease. The Contaminated Blood Scandal saw an estimated 30,000 people in the UK given blood transfusions and blood products infected with hepatitis C, hepatitis B and HIV. More than 3,000 people died as a result, and thousands more live with on-going health complications. For my final Christmas article for Readers Digest, I wrote on Stephen Christmas, a tireless campaigner for blood safety who lived with haemophilia and died in 1993, having contracted HIV through contaminated blood. 

I was a blood donor. However, I am now unable to donate blood or organs for the rest of my life since there is a possibility that my blood is ‘stained’, possibly with prion disease, after adopting embryos. The Blood Transfusion Service will not accept donations from women who have had various fertility treatments. 

And there’s another uncomfortable truth about blood donation – the NHS does not have enough blood, organs, tissues, platelets, plasma or stem cells to treat everyone who needs it. As a nurse, I remember caring for a man dying of liver cancer. Suffering from sudden, massive melaena (blood loss in black, tarry stools as a result of internal bleeding), he received emergency blood transfusion, with bag after bag of blood being infused, until the consultant called for the treatment to stop, because the bleed was too big – and blood supplies too scarce.  

Struggling to accept the stark reality of stained blood and dangerous shortages, I kept coming back to an old Sunday School song about blood, where absolute abundance and ultimate cleansing are instead promised. 

There is a fountain filled with blood 
   Drawn from Immanuel’s veins; 
And sinners, plunged beneath that flood, 
   Lose all their guilty stains. 

Gruesome and graphic in its imagery, but full of deeper meaning. And as a nurse, I’m accustomed to blood, sometimes lots of it. I’ve seen that man bleed out on the ward that night; I’ve attended a road accident, where a boy lost his leg – but not his life, because towels stemmed the massive flow of blood. I’ve raced a patient to the operating theatre after her aortic aneurysm burst within; I’ve stemmed arterial bleeding from the groin by applying prolonged pressure to the site punctured by a catheter during cardiac stenting. According to the World Health Organization, severe bleeding after childbirth is the leading cause of maternal mortality world-wide. Each year, about 14 million women experience postpartum haemorrhage resulting in about 70,000 maternal deaths globally.  

In the Bible, and in hymns of praise like this one, there is also no getting away from blood. “Like it or not, the Bible is a bloody book,” writes  Kyle Winkler. It runs through the book like a crimson thread. There’s a story of a woman bleeding for twelve years, until she touched the hem of Jesus’ garment and was healed.    

Elsewhere the Bible keeps returning to the idea of blood, shed in sacrifice, used to cleanse, save, and heal in a spiritual sense. In the Old Testament, animal blood was painted on doorposts at Passover as a sign of protection from judgment, and sprinkled ritually on the altar as a sacrifice for human sin, restoring relationship with God.  

On Good Friday, Jesus himself shed (and sweat) his blood, sacrificing his life on the cross to “wash our souls” once and for all. Millions of Christians across the world take a sip of communion wine each Sunday in commemoration of this act. It’s a beautiful gift, coming with a promise that the shed blood will “preserve thy body and soul unto everlasting life”, through the forgiveness of sins. It’s no wonder then that churches love to sing about this blood. “Would you be free from the burden of sin? There's pow'r in the blood, pow'r in the blood,” goes one hymn, while another simply says, “Your blood has washed away my sin, Jesus, thank you”.  

“God’s intention for blood isn’t gory—it’s beautiful! And I’m certainly not offended or scared by it,” writes Kyle. “Rather than question how little blood I can get by with, I’d rather stand under the cross to be covered in all that I can get!” Thank God for the fountain of forgiveness that flows from Good Friday. 

  

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We don’t have an over-diagnosis problem, we have a society problem

Suzanne O’Sullivan's question is timely
A visualised glass head shows a swirl of pink across the face.
Maxim Berg on Unsplash.

Rates of diagnoses for autism and ADHD are at an all-time high, whilst NHS funding remains in a perpetual state of squeeze. In this context, consultant neurologist Suzanne O’Sullivan, in her recent book The Age of Diagnosis, asks a timely question: can getting a diagnosis sometimes do more harm than good? Her concern is that many of these apparent “diagnoses” are not so much wrong as superfluous; in her view, they risk harming a person’s sense of wellbeing by encouraging self-imposed limitations or prompting them to pursue treatments that may not be justified. 

There are elements of O-Sullivan’s argument that I am not qualified to assess. For example, I cannot look at the research into preventative treatments for localised and non-metastatic cancers and tell you what proportion of those treatments is unnecessary. However, even from my lay-person’s perspective, it does seem that if the removal of a tumour brings peace of mind to a patient, however benign that tumour might be, then O’Sullivan may be oversimplifying the situation when she proposes that such surgery is an unnecessary medical intervention.  

But O’Sullivan devotes a large proportion of the book to the topics of autism and ADHD – and on this I am less of a lay person. She is one of many people who are proposing that these are being over diagnosed due to parental pressure and social contagion. Her particular concern is that a diagnosis might become a self-fulfilling prophecy, limiting one’s opportunities in life: “Some will take the diagnosis to mean that they can’t do certain things, so they won’t even try.” Notably, O’Sullivan persists with this argument even though the one autistic person whom she interviewed for the book actually told her the opposite: getting a diagnosis had helped her interviewee, Poppy, to re-frame a number of the difficulties that she was facing in life and realise they were not her fault.  

Poppy’s narrative is one with which we are very familiar at the Centre for Autism and Theology, where our team of neurodiverse researchers have conducted many, many interviews with people of all neurotypes across multiple research projects. Time and time again we hear the same thing: getting a diagnosis is what helps many neurodivergent people make sense of their lives and to ask for the help that they need. As theologian Grant Macaskill said in a recent podcast:  

“A label, potentially, is something that can help you to thrive rather than simply label the fact that you're not thriving in some way.” 

Perhaps it is helpful to remember how these diagnoses come about, because neurodivergence cannot be identified by any objective means such as by a blood test or CT scan. At present the only way to get a diagnosis is to have one’s lifestyle, behaviours and preferences analysed by clinicians during an intrusive and often patronising process of self-disclosure. 

Despite the invidious nature of this diagnostic process, more and more people are willing to subject themselves to it. Philosopher Robert Chapman looks to late-stage capitalism for the explanation. Having a diagnosis means that one can take on what is known as the “sick role” in our societal structures. When one is in the “sick role” in any kind of culture, society, or organisation, one is given social permission to take less personal responsibility for one’s own well-being. For example, if I have the flu at home, then caring family members might bring me hot drinks, chicken soup or whatever else I might need, so that I don’t have to get out of bed. This makes sense when I am sick, but if I expected my family to do things like that for me all the time, then I would be called lazy and demanding! When a person is in the “sick role” to whatever degree (it doesn’t always entail being consigned to one’s bed) then the expectations on that person change accordingly.  

Chapman points out that the dynamics of late-stage capitalism have pushed more and more people into the “sick role” because our lifestyles are bad for our health in ways that are mostly out of our own control. In his 2023 book, Empire of Normality, he observes,  

“In the scientific literature more generally, for instance, modern artificial lighting has been associated with depression and other health conditions; excessive exposure to screen time has been associated with chronic overstimulation, mental health conditions, and cognitive disablement; and noise annoyance has been associated with a twofold increase in depression and anxiety, especially relating to noise pollution from aircraft, traffic, and industrial work.” 

Most of this we cannot escape, and on top of it all we live life at a frenetic pace where workers are expected to function like machines, often subordinating the needs and demands of the body. Thus, more and more people begin to experience disablement, where they simply cannot keep working, and they start to reach for medical diagnoses to explain why they cannot keep pace in an environment that is constantly thwarting their efforts to stay fit and well. From this arises the phenomenon of “shadow diagnoses” – this is where “milder” versions of existing conditions, including autism and ADHD, start to be diagnosed more commonly, because more and more people are feeling that they are unsuited to the cognitive, sensory and emotional demands of daily working life.  

When I read in O’Sullivan’s book that a lot more people are asking for diagnoses, what I hear is that a lot more people are asking for help.

O’Sullivan rightly observes that some real problems arise from this phenomenon of “shadow diagnoses”. It does create a scenario, for example, where autistic people who experience significant disability (e.g., those who have no perception of danger and therefore require 24-hour supervision to keep them safe) are in the same “queue” for support as those from whom being autistic doesn’t preclude living independently. 

But this is not a diagnosis problem so much as a society problem – health and social care resources are never limitless, and a process of prioritisation must always take place. If I cut my hand on a piece of broken glass and need to go to A&E for stiches, I might find myself in the same “queue” as a 7-year-old child who has done exactly the same thing. Like anyone, I would expect the staff to treat the child first, knowing that the same injury is likely to be causing a younger person much more distress. Autistic individuals are just as capable of recognising that others within the autism community may have needs that should take priority over their own.   

What O’Sullivan overlooks is that there are some equally big positives to “shadow diagnoses” – especially as our society runs on such strongly capitalist lines. When a large proportion of the population starts to experience the same disablement, it becomes economically worthwhile for employers or other authorities to address the problem. To put it another way: If we get a rise in “shadow diagnoses” then we also get a rise in “shadow treatments” – accommodations made in the workplace/society that mean everybody can thrive. As Macaskill puts it:  

“Accommodations then are not about accommodating something intrinsically negative; they're about accommodating something intrinsically different so that it doesn't have to be negative.” 

This can be seen already in many primary schools: where once it was the exception (and highly stigmatised) for a child to wear noise cancelling headphones, they are now routinely made available to all students, regardless of neurotype. This means not only that stigma is reduced for the one or two students who may be highly dependent on headphones, but it also means that many more children can benefit from a break from the deleterious effects of constant noise. 

When I read in O’Sullivan’s book that a lot more people are asking for diagnoses, what I hear is that a lot more people are asking for help. I suspect the rise in people identifying as neurodivergent reflects a latent cry of “Stop the world, I want to get off!” This is not to say that those coming forward are not autistic or do not have ADHD (or other neurodivergence) but simply that if our societies were gentler and more cohesive, fewer people with these conditions would need to reach for the “sick role” in order to get by.  

Perhaps counter-intuitively, if we want the number of people asking for the “sick role” to decrease, we actually need to be diagnosing more people! In this way, we push our capitalist society towards adopting “shadow-treatments” – adopting certain accommodations in our schools and workplaces as part of the norm. When this happens, there are benefits not only for neurodivergent people, but for everybody.

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