Why girls' blood cells have more creatine after puberty
Elevation of erythrocyte creatine post-puberty unrelated to erythrocyte lifespan: Implications from the lack of correlation between HbA1c and erythrocyte creatine.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Erythrocyte creatine rises sharply with age in girls but not in boys, despite no difference in HbA1c or glucose levels.
It contradicts the assumption that EC primarily reflects red blood cell turnover or metabolic state. Instead, it appears tied to female puberty — a factor not previously emphasized in clinical interpretation.
Practical Takeaways
Clinicians should interpret erythrocyte creatine levels cautiously in adolescent girls, especially after menarche, as higher levels may not indicate abnormal red blood cell turnover or glycemic issues.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Erythrocyte creatine rises sharply with age in girls but not in boys, despite no difference in HbA1c or glucose levels.
It contradicts the assumption that EC primarily reflects red blood cell turnover or metabolic state. Instead, it appears tied to female puberty — a factor not previously emphasized in clinical interpretation.
Practical Takeaways
Clinicians should interpret erythrocyte creatine levels cautiously in adolescent girls, especially after menarche, as higher levels may not indicate abnormal red blood cell turnover or glycemic issues.
Publication
Journal
Clinica chimica acta; international journal of clinical chemistry
Year
2025
Authors
Takahide Kokumai, Shigeru Suzuki, Satoru Takahashi, T. Okumiya, Masafumi Koga
Related Content
Claims (4)
Your HbA1c number isn't just about your average blood sugar — it also depends on how long your red blood cells live. The longer they stick around, the more sugar builds up on them, which can raise your HbA1c even if your blood sugar is stable.
Girls who have started their periods tend to have higher levels of creatine in their red blood cells compared to those who haven’t, and this doesn’t seem to be because of differences in blood sugar control.
In teenage girls who don’t have diabetes or anemia, red blood cell creatine goes up as they get older, especially after puberty—but this doesn’t happen in boys. This rise isn’t linked to blood sugar levels.
In kids who don’t have diabetes or anemia, red blood cell creatine doesn’t seem to track with average blood sugar levels, so it might not be a good way to measure sugar exposure over time.