No you’re right, it’s not long enough to be a Hemsworth’s mobile number but actually it’s more sought after 😉 If you’re up to date with reading & recognising all the different patterns of Iron Studies & the stories they tell, which is a daily business for most of us, then you will know by heart the striking pattern we call, ‘Pseudo Iron Deficiency’. You know the one where your patient’s serum iron & transferrin saturation are mischievously trying to trick you into thinking you need to give this patient iron…when in fact this is absolutely not what they need!
This is of course the result of the redistribution of iron during inflammation – iron is actively removed from the blood and sequestered in the liver instead. It’s designed to protect us from bacterial bogeymen, which is how our stone-age bodies interpret all inflammation of course.
But for those of you nodding so hard you’re at risk of doing yourself an injury, this number is for you. We’ve often talked about the redistributional increase in patients’ ferritin levels in non-specific terms: it goes up..but by how much? Of course we would like to know because no one is fooling us with this transiently inflated value…but can we make an estimation as to what this person’s ferritin will drop to once this inflammation is resolved? Yes.
Write it down. Consider a tattoo, perhaps?
This glorious magic number comes from Thurnham et al paper in 2010 who did the number crunching on over 30 studies involving almost 9,000 individuals to determine the mathematical relationship between inflammatory states & markers and the reciprocal increases in ferritin. Their work is exceptional in that it also differentiates between incubation (pre-symptoms), early and late coalescence periods (if you want to differentiate your patients in this way and get even more specific then you need to read the paper), however, overall when we see a patient who has a CRP ≥5 mg /dL , we can multiply their ferritin by 0.67 and get a lot closer to the truth of their iron stores. Oh and another important detail they revealed, this magnitude of ferritin increase is more likely seen in women or those with baseline (non-inflamed) values < 100 ug/L..so generally more applicable to women than men. Thanks Thurnham and colleagues and the lovely Cheryl, my previous intern who brought this paper to my attention…you just took the guessing out of this extremely common clinical scenario 🙂
We’re not deaf…we heard that stampede of Iron-Inundated Practitioners! The Iron Package is for you!
Our recordings and clinical resources for improving your skill-set in all things iron including, your accuracy of diagnosing deficiencies, pseudo-deficiencies & excesses, plus radically rethinking the best treatment approaches for each scenario…have been some of our most popular. Because nailing iron (pardon the pun) is harder than we were all lead to believe and at least 1 ‘iron maiden’ or ‘iron man’ walks into our practice every day, right? So we’ve brought together 5 extremely popular UU30’s on Iron into one bundle for the price of 4! So if you’re more than ready to graduate from ‘iron school’, now’s your best chance!