Our expert says:
If the haemoglobin test was failed, then there is a good chance that the problem is largely right there. It's not all of it, I'm sure, and on that first ride, being unfit may have had a lot to do with it. I would be interested to know exactly how the rides have gone since, and also what you did after failing this haemoglobin test. The other thing of interest is exactly how low your haemoglobin was at that time, and then when you had your medical, whether it was also on the low, but still normal side. I'm not exactly sure what could cause a drop - it's not inconceivable that your haemoglobin levels would fluctuate slightly, and so it's possible that when you had your medical (I'm not sure if blood tests were done here, I doubt it) everything was fine but your haemoglobin was hovering around the low levels, and then dropped only slightly before your donation was failed later on.
Having said all this, if it is a case of haemoglobin (in the absence of any pathology, because there are conditions that can can cause red blood cells to be broken down, and then you sometimes get symptoms like a reddish colour or blood in the urine, which maybe you have noticed), then the answer is simple - you just have to increase your iron intake, either with tablets or injections. I would certainly recommend that you see a doctor, have a full battery of tests done, because the BTS test is quite rapid and hence not complete, and so there may be something else at play here, and then hopefully once you identify that it is anemia, you can rapidly treat it and get back to the regular exercise. Hopefully it is as simple as that.
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